Sunday, July 10, 2011

A Pity Most of These Guys Weren't Repuke T'errists!


The Highland Charity event, in which a "running of the Bulls" was duplicated - with more than 200 runners (mostly males) sprinting to escape a whacking by the Rocky Mountain Roller Girls- came off like clockwork. Afterwards, most of those in the "run" were still licking - or rather tending to- their "wounds", some of them absorbing as many as twenty whacks with plastic bats wielded by girls who were no weak sisters!

One guy was heard to moan: "Awww....she didn't have to hit me THAT hard! That was more vicious than a pugil stick thrashing!" While one of the few sprinting women confessed she was chased down especially hard, and whacked "dozens of times" before finally escaping. According to her:

"In Spain the real bulls will keep running. Here, they turn around and whack you again...and again...and again!"

"Barbie Boop" (her nickname) said she lost count (after twenty) of how many runners she whacked. She was more distracted by their screaming in pain. "Oh, puh-leeze! Not again! I'm runnin' as fast I can, missy! Gimme a break!"

THWACK!

"YeOOWWW!"

The tragedy is that most of these guys were just hyper macho types who believed they could show off for their mothers and girlfriends and out run the Rollergirls - while absorbing the pain they dished out with each predictable interception. What we really needed was to have all the current Repuke debt terrorists and assholes in the middle of it. You know, those pricks such as Eric Cantor, John Boehner and Mitch McConnell - each getting whacked into insensibility for their continued intransigence which will see this nation default on its debt if their better angels aren't made to prevail. I firmly believe about fifty whacks EACH with the Rollergirls' plastic bats ought to have iced the deal and....err....."changed their attitude".

Even as the slimey R-bastards have refused to seal a deal - with at least some higher taxes - they did approve a $649 BILLION defense waste budget - $17 billion more than was asked for by the Pentagon! They approved this, while at the same time torpedoing an extra $1 billion for food assistance to low income women (mainly single mothers), assistance for seniors' with high utility bills, and $1.6 billion to expedite the James Webb Space Telescope - the next generation instrument after the Hubble is mothballed.

How can these fuckers sleep at night? How can they do it when we all know what their plan and game is! It's to use tax cuts and military spending in combination as a cynical device to "starve the beast" so nothing will be left for any domestic needs- whether infrastructure maintenance, or assistance (in nutrition) for malnourished kids and their moms. Apart from that, just one fifth of what they just pissed away with that $649b on useless military garbage (for our "freedoms" - sic) could have been used to mount a decent manned Mars expedition! No wonder this country has no more vision, including for space exploration. It's all been pissed away down ratholes in Iraq and Afghanistan. Meanwhile, Osama is laughing from his grave as we near a debt default - largely arising from debt accumulated while pursuing him and his robed loonies! Mounting 2 major military invasions with over a half million troops for basically, a ragtag gang of maybe 1,000 - whose most advanced equipment on 9-11 was......box cutters!

Yes, the Repukes truly need to have their weasley asses beaten to a pulp which is why...maybe...the Colorado Rollergirls ought to pay these punks a little visit on Capitol Hill! Here's a clue, girls: Whack Boehner hard enough and he will cry for mommy. His tears will flow like rivers! Whack him, Cantor and McConnell as hard you whacked those poor putzes yesterday, and maybe they'll come to their senses and sit down ready to deal with Obama for once! Seriously, not as charlatans and hucksters for Grover Norquist! Another grad-A asshole who needs his ass thrashed!

Solutions for Part 24 (Radioactivity)



We now examine the solutions for Part 24 (Introduction to Basic Physics) on radioactivity. The problems were:

1) Sketch the radioactive decay curve for the practical problem and confirm that the half life is 6 hrs.

2) A point source of gamma radiation has (T½) = 30 mins. The initial count rate recorded by a G-M tube is 360/s. Find the count rate that would be recorded after 4 half lives. Sketch the decay curve and determine the activity, A.

3) At a certain instant, a sample of a radioactive material contains 10^12 atoms. The half life of the material is 30 days.

a) Calculate the no. of disintegrations in the first second.

b) The time elapsed before 10,000 atoms remain.

c) the count rate corresponding to the time in (b).

4) Find the half life of the beta particle emitting nuclide, 32P 15, if the activity A = 5.6 x 10^-7 /s.

The solutions are as follows:

1) The sketch of the decay curve for Problem (1) is shown, and we note it conforms to the half life (T½) = 6h, already computed.

2) The decay curve is shown for Problem 2 (accompanying sketch graph) and we see on inspection that since the counts per minute decreases frmo 360 to 180 in ONE half life (e.g. 1(T½)). The critical aspect to note is that the time is given in units of HALF LIVES not hours! Thus, since 1(T½)= 30 mins. = 1800s then (T½)= 1800 s. This is confirmed from the curve since the 180 counts/min decreases to 90 in 2 half-lives, and this decreases to 45 in 3 half lives and so on.

The activity A = ln 2/(T½) = 0.693/ 1800s = 3.85 x 10^-4 s

3) (a) The activity is: A = 0.693/(T½)

But: (T½) = 30 days x 24 h/day x 60 m/h x 60 s/m = 2,592,000 s

So: A = 0.693/ (2,592,000 s) = 2.67 x 10^-7 /s

So the no. disintegrations/sec for the sample with 10^12 atoms:

= (2.67 x 10^-7 /s) (10^12 ) = 2.67 x 10^5 = 267,000

(b) The decay curve is an exponential function, so we must have:

N = N(o) exp (-At)

where N = 10^4 and N(o) = 10^12

Then:

10^4 = 10^12 exp (-At)

or 10^-8 = exp (-At)

for which we know the value of A and can solve for t:

e.g. -8 = (-A) (t)

t = 8/A = 8/(2.67 x 10^-7/s) = 2.99 x 10^7 s

t = (2.99 x 10^7 s)/ (86400 s/day) = 346.7 days

t = 348 days (approx.) = 11.6 (T½) - call it 12 half lives

c) Then the disintegrations per second must decrease from 267,000 over 12(T½)

The new rate = 65 disintegrations/sec

(4) A = 5.6 x 10^-7 /s.

(T½) = ln 2/ A = 0.693/ (5.6 x 10^-7 /s)

(T½) = 1.24 x 10^6 s = 14.3 days

"Uncle Tom" a racist epithet? Hardly!


Seems that certain wingnut bloggers - who have no problem showing Obama with ropes around his neck!- are in a snit over my use of the appellation "Uncle Tom" for Thomas Sowell. In one blog they expend nearly 2,000 words trying their best to argue it's a display of "racism on the Left". Hardly! But then why should one be amazed that these guys have so little basic insight when most of their history education stopped in 8th grade? I mean they can't even tell the difference between German National Socialism and Stalinist Socialism, incessantly conflating the two - though we know Hitler slaughtered Marxists and Stalinist Socialists by the millions!

In truth, the term "Uncle Tom" is quite legitimate, especially as applied to any black man that deliberately and knowingly undermines the advancement of his own race, as Thomas Sowell has consistently done via his endless columns on behalf of Wall Street oligarchs, rich White CEOs and the WHITE Neoliberal Overclass elites of this country. When you churn out propaganda piece after propaganda piece, with no thought how it undermines your own race you are an Uncle Tom!

Only in today's paper (Denver Post, Business, p. 1E) has the evidence now emerged that the black middle class has been decimated by the recession. Nearly 12 million African-Americans now find themselves dumped from the Middle Class into the poor or working class by having lost their jobs during the Recession and having their homes foreclosed. Yet Mr. 'Whitey Racist's' "hero", Tom Sowell, has been pumping and humping those very policies (e.g. more tax cuts, less bank regulation etc.) that evicted his fellow blacks in his very columns! He even puts the blame on THEM for buying sub-prime loans when the whole Wall Street gimmick was to fob off sub-primes on homeowners to diffuse credit default swaps! He's as shameless in his blame as he is in his disingenuous efforts to destroy social safety nets for the elderly as well as African-Americans!

How bad is it? The median net worth of the African-American household has now dropped to $2,970 - according to the Post article. Nearly 8% of Middle class blacks have seen their homes foreclosed, since 2008. Many more have lost their health insurance and have difficulty qualifying for Medicaid - for which Mr. Thomas Sowell (though he purportedly grew up in poverty)seeks to have funding eviscerated, like he does for Medicare and Social Security.

Sowell, for example, wants to have the age to qualify for Social Security raised to 67 despite the fact that the average black male only lives to a median age of 65! How is THIS not racist?

The sad fact here is the 'Uncle Tom" sobriquet fully applies because it is abundantly clear Thomas Sowell is "the Man's" house slave, doing his bidding to undermine his fellow blacks - with whom he no longer sees any affinity or common bond. I mean he's getting paid to write this drivel for "the Man" in the same way a house slave before the Civil War might have received perks (e.g. reading -writing privileges) for ratting on the field slaves!In that sense he's also little different from a miscreant black repuke candidate named Herman Cain. But at least, in the latter case, that Uncle Tom's probability of becoming president is little more than the probability of Martians landing at the Capitol in two days to abduct all the Repukes - sparing us their terrorist debt ceiling extortion!

During Hitler's Holocaust, Traitor Jews called "Sonderkommando" were used by the Nazis to sweet talk Jewish inductees to the Concentration camps into disrobing for "showers" when they knew it was to allow many thousands to be gassed - while their clothing could be given away.

In what he's done with his PR and columns for the capitalist, reich wing oligarchy and entrenched Neoliberal system (which espouses the value of profits and "free markets" over human welfare), Uncle Tom Sowell is little better than a Black Sondercommando. And it doesn't matter if his reich wing, racist tribe of know nothing worshippers see that or not!

We might believe their professed "sincere" kudos for token blacks (like Herman Cain or Tom Sowell) aren't invoked to conceal or misdirect from their wingnut racism - when they themselves stop showing Obama with ropes around his neck, or in Hitler uniforms with Hitler mustache!

Saturday, July 9, 2011

"Uncle Tom" Sowell: As Disingenuous and Clueless as Ever!


It appears that Uncle Tom Sowell is back at it again, trying to bamboozle and befuddle his readers into buying even more of his hogswill and PR. So let's get right down to it and skewer his latest bull crap:

He writes:

The data show that "the rich" supplied less tax revenue to the government when the top income tax rate was 73 percent in 1921 than they supplied after the income tax rate was reduced to 24 percent in 1925.


Sowell here is more than disingenuous! The reason the rich supplied "less tax revenue in 1921" was because loopholes littered the tax landscape. By the time these were eliminated in the Eisenhower Administration (with the highest marginal rate at 91%) the benefits were immediate and obvious (as economists Medoff and Harless also note in their book ‘The Indebted Society’- showing that high tax rates correlate to higher productivity, investment and employment).

Several things I recall regarding those seriously high tax Eisenhower years:

- Unemployment was at its lowest in the last 60 yrs.

- Banks actually provided decent interest rates (e.g. 4-5%) so workers didn’t have to risk their money in a stock market

- A one income family was the norm as opposed to being an aberration.

- There was no need for health insurance companies. Doctors saw patients one on one, and if payment options were needed, they gladly gave them.


Meanwhile, the lowering of the highest marginal tax rate to 2.4% in 1925 was an economic catastrophe. It engendered so much “cheap money” that it fueled a speculative mania on Wall Street, encouraging speculators and moneymen to invent “investment trusts” touted as stock market alternatives for the little people. But after millions bought in with their fragile earnings, the speculators manipulated the markets (owing to the low aggregate demand)and the stock market crashed in October, 1929 setting off the Great Depression.

This was a direct result of speculation overreach fueled by the too low Coolidge tax cuts on the wealthy. (Who were able to use all the extra money to buy off lawmakers on Capitol Hill to render the investment trusts legal.) Meanwhile, unmentioned by Sowell, is that tens of thousands of elderly were left to die by themselves because they lacked any money, adequate personal resources or health care. Hence the case for providing social insurance to the majority at the end of life, despite the cant and rant of the individualist battalion.

More fungible nonsense from Sowell:

Because high tax rates can easily be avoided, both then and now, "the rich" were much less affected by high tax rates than was the economy and the people who were looking for jobs. After the Coolidge tax cuts, the increased economic activity led to unemployment rates that ranged from a high of 4.2 percent to a low of 1.8 percent.
But that is only a fact about reality -- and, for many, reality has no such appeal as talking points.



Again, this is a deceitful or pseudo-fact, so its priceless that HE'S the one talking of reality having no appeal! The only reason high tax rates can be avoided –whether then or now- is because of the loopholes allowed, e.g. for charitable trusts, etc.. When these are eliminated or minimized, as in the Eisenhower years- then the whole society can benefit. ALSO, the nonsense that high tax rates mean more people “looking for jobs” is unsupported. In fact, the highest level of job creation over the past 25 years (20 million jobs added) was during the Clinton administration when the marginal tax rates were only a few percentage points more than now (39.5% vs. 36%). Meanwhile, in the administration of George W. Bush – when the Clinton rates were lowered, job creation fell off by more than 45%. During the last 4 years of the Bush administration more jobs were lost than created.

Sowell blathers again:

The same preference for talking points, and the same lack of interest in digging into the facts about realities, prevails today in discussions of whether to have a government-controlled medical system. Since there are various countries, such as Canada and Britain, that have the kind of government-controlled medical systems that some Americans advocate, you might think that there would be great interest in the quality of medical care in these countries.

Here Sowell again evinces his trademark typical dishonesty by failing to distinguish between government-controlled health systems and single payer systems. This exploits the ignorance of the typical American (whose knowledge level is next to pathetic) and was last seen two years ago when Obama’s health care plan was demagogued as “Socialist” when it was really a rehash of a REPUBLICAN alternative to ‘Hillarycare’ from 1993.

Now let’s make it clear: Single payer systems such as in Canada and Barbados are NOT “government controlled”! Doctors still maintain their own services, offices, times of appointment etc., set rates and the hospitals take in people – who may choose what level of care they wish, including private or public rooms (which are cheaper). For example, when I had my tonsils taken out in Barbados, I elected to have a private room and private surgeon who was affiliated with the Queen Elizabeth Hospital but not “controlled” by the government. The only thing he was subject to was a maximum rate or standard to be charged for the operation.

Now, instead of having to rely on some health insurance company or other (whose standards vary) the government paid the surgeon for the operation, while I paid a little more for the private room.

Thus, like in Canada, single –payer means just that: there is ONE payer, the government, as opposed to hundreds of potential private payers. This means the administrative waste is vastly less, so in Barbados and Canada health care is less per capita. This means more of every health care dollar actually goes to health care, as opposed to paper pushing! While 2.9% is spent on administration in Canada and 5% in Barbados, fully 32% of all medical costs are eaten up by administrative paper pushing in the States – precisely because there are so many private payers, each of whom has its own paperwork, standards, and rules. This paper work also has a tendency to expand on and on, for example if a treatment or procedure is rejected and the claim must be re-submitted. This is IDIOCY by any standard, but evidently Uncle Tom (like his many clones) loves it!

As for quality of care, it is superior in many ways to the U.S. particularly because the stays in hospital are provided on a genuine NEED basis, as opposed to being chucked out before a surgery wound heals and getting complications. (As occurred to my wife when she had a gall bladder operation here in the U.S. in 1993, and had to leave the next day, getting complications)

In addition, the medical error fatality rates in Barbados and Canada are far far less than in the U.S. While 98,000 die per year from medical mistakes in the U.S. system, the per capita death rates in Canada and Barbados are some 55-65% lower. Again, I suspect this is a function of greater attention to details such as disinfection, while in the money grubbing U.S. the emphasis is on speed and profit.

More bunk from Uncle Tommy:

The data are readily available as to how many weeks or months people have to wait to see a primary care physician in such countries, and how many additional weeks or months they have to wait after they are referred to a surgeon or other specialist. There are data on how often their governments allow patients to receive the latest pharmaceutical drugs, as compared to how often Americans use such advanced medications.

Again, Sowell plays on engrained American ignorance and their penchant for exceptionalist bunkum. As a case in point, 8 yrs. ago in Canada my niece had injured her back and required some surgery as well as therapy. She was admitted to hospital in Toronto within 3 days, recuperated and received therapy immediately after. In the States similar treatments would have left her bankrupt. Meanwhile, in 1991, my wife’s medical emergency occurred with a fall and her needing a hysterectomy. She was admitted within 24 hours, recuperated for one week, and was released with no ill effect – including to our savings!

The bit about the pharmaceutical drugs is overplayed. All patients, and citizens in both Barbados and Canada, can access a National Formulary and obtain whatever prescription drugs needed there, for small ($5) copays. In addition, drug companies are not allowed to advertise their wares in those countries – which translates into fewer specious or unnecessary prescriptions provided to patients (who just want it because it was seen on TV).

“Advanced medications” is a claim open to further examination and scrutiny. The evidence is that, in fact, most Americans are over-medicated with TOO MANY medications, advanced or otherwise, leading to additional, increased medical costs. For example, ‘Lamisil’ is often prescribed for toenail fungus but the complications – including liver damage- are never mentioned to prospective patients. Similarly with Statins, which can cause not only kidney and liver failure but other problems and thus add to the medical burdens. Blood pressure medications taken over time, can also affect the glomerular filtration rate of the kidneys- leading to kidney damage. As the author of Overtreated: Why Too Much Medicine is Making Us Sicker and Poorer notes, many of these “advanced medications” are majorly adding to our health care costs via their complications!

More Sowell slop:

But supporters of government medical care show virtually no interest in such realities. Their big talking point is that the life expectancy in the United States is not as long as in those other countries. End of discussion, as far as they are concerned.


But in a way it IS ‘end of discussion’! After all, if the most “advanced” medications and health care (so claimed) can’t deliver either greater longevity or lower infant mortality (we still have among the highest rate in the world) then what use is it? So Sowell has no basis on which to complain! If the U.S. medical care was worth its actual cost and private system, men should have an average life expectancy of 85 years (as opposed to 75 years) and women should be at 90 years, as opposed to 82. The tragic truth is that nearly 90% of all advanced medical technology (and with it, major expense) is commandeered over the last 6 months of life, trying to medically extend it. It seldom if ever works, meaning hundreds of thousands of dollars are often spent to gain a couple extra months (using advanced medical technology, surgery, etc.) when a stay in a hospice would be more sensible and cost-effective.


Lastly Sowell babbles:

They have no interest in the reality that medical care has much less effect on death rates from homicide, obesity, and narcotics addiction than it has on death rates from cancer or other conditions that doctors can do something about. Americans survive various cancers better than people anywhere else. Americans also get to see doctors much sooner for medical treatment in general.

But again Sowell uses a clever dodge. In many ways those indices he claims that are beyond control (homicide, obesity, narcotics addiction) can be directly tied to the accessibility of medical care. For example, nearly half of all homicides are triggered by depression or some other mental aberration. In most of those cases the perpetrators have no health insurance so can’t afford to get therapy or even anti-psychotic medications. This brings up a recent Colorado case in which a woman found guilty of vehicular homicide (killing a family of 5) was found to have been out of the health system for more than five years, and without ability to get medication. (This occurred after major state budget cuts in Colorado which left psychiatric care unfunded.) Obesity also is more prevalent among those lacking health insurance. It is also a result of a nation which places private profits above the value of its citizens’ health.

For example some studies have found that as much as 70% of American obesity can be tied to the prevalence of high fructose corn syrup in hundreds of products. (It’s even in cough medicine!) This stuff is a spin-off from corn production, but rather than throw it away – and lose profits – corn producers sell it to food or other manufacturers to be incorporated at a high (health) cost to consumers!

As for cancers, it is debatable that Americans survive cancers better than people anywhere else. While it is true we have much more advanced screening – from colonoscopies, to PSA tests, to mammograms- much of this translates to OVER-screening, which is having a compounding effect of adding to the medical costs and burdens without proportional positive results. For example, the PSA test – for prostate cancer- is capable of yielding many false positives. Even when it does yield a valid positive, the finding often occurs so late in life that it is arguable that getting surgery (leading to incontinence – other complications) is worth it. Many findings show the person more likely to die of old age than from the cancer (since most prostate cancers are slowly growing). As the author of 'Overtreated' observes (p. 201):

"The evidence suggests that PSA testing is not saving any lives, and even if it is, the large numbers of men who are treated unnecessarily are paying a terrible price. They're the equivalent of civilian casualties in our war on cancer."


The same applies to other screenings which are creating some 16% more people per year seeking cancer treatments – at great cost- and little benefit. As one medical worker, an oncologist, put it in a recent TIME magazine special article: "At the rate we’re generating cancer patients from our screenings, we won’t be able to treat them all in another 10 years! We're running short of chemo drugs now!”

The author of 'Overtreated' attributes this overuse of diagnostics and screenings to "magical thinking". As she puts it (ibid.):

"We all want to believe that early diagnosis of cancer will protect us, that if we dutifully head to the doctor for our yearly screening tests we can avoid disease and even thwart death. And yet many of the screening tests we imagine will protect us- mammography, colonoscopy and more recently CT scans to screen for lung cancer- suffer from many of the same drawbacks as the PSA test. The only cancer screening that has been shown unequivocally to decrease mortality is the venerable Pap smear for cervical cancer."

This suggests there is a diminishing returns threshold for all such screenings. Maybe some Americans, perhaps most, need to learn to live with their cancers as opposed to becoming hysterical about removing them. (The same 'TIME' piece noted the name for many of these cancers that "accidentally" turned up, e.g. during MRIs or CT scans, as "accidentoplasms". Thus, increasing use of scans is actually generating MORE cancers, needing more treatments, adding MORE costs!)

Maybe Sowell needs to finally get HIS facts straight before going to print again!

Introduction to Basic Physics (Radioactivity) - Pt. 25





We now come to the final part of the Basic Physics blog course: Radioactivity. The objective here is to get students (or interested readers) to appreciate and recognize the various types of radioactivity - in the form of their specific particles- and how these can be measured in terms of activity. Probably the last part is the most intuitive and easiest, so we begin with that: using a device called the Geiger Muller counter (shown in Fig. 1) with the general principle illustrated in Fig. 2

First, note that Fig. 2 is a simplification. In actual fact the anode is a tungsten wire with extends through the cathode, which is a metal cylinder. Both are then fitted into a gas-filled envelope which is the "Geiger-Muller" tube. A typical low pressure gas to use for the tube is Argon (Ar) which at a pressure of about 10 cm of Hg (compared to 76 cm Hg for atmospheric) easily fills the tube via diffusion. A potential difference (p.d.) of 900- 1,000 V is then applied between the anode and cathode (A and C in Fig. 2). The applied p.d. has the effect of slightly stressing the Argon in the tube so when radiation enters its ionizing action produces more ions from the gas in the tube. (In other words, the radioactive substance causes the gas atoms to lose electrons, hence be ionized).

The electric field produced (e.g. E = V/d) then accelerates these ions and many more ions are produced by way of collisions. In effect, an ionizing current is quickly built up and triggers the tube which is connected externally through an amplifier to a count-rate meter which gives the counts per minute (cpm).

Radioactivity basically occurs in three forms, as determined by the particles: alpha-radiation (from alpha particles or Helium nuclei), beta radiation, from beta particles or electrons, and gamma radiation, from gamma particles or very high energy photons (e.g. at very short wavelengths, hence can easily penetrate tissue).

The simple diagram of Fig. 3, using a simple experiment, graphically shows the differences in the radiations with respect to an applied magnetic field. If one holds the thumb of one's RIGHT hand into the image (to represent the B-field direction) then the electrons (beta particles) will display a direction coincident with the curving fingers of the right hand. That is, clockwise. Now, since the alpha particles are positively charged (, e.g. He++, as opposed to the negatively charged beta particles, e.g. e-) they will go in the opposite direction- as shown.

The gamma rays, meanwhile, suffer no deflection in the field because they have zero charge, being photons of light. In terms of penetration power these additional differences apply:

1) Alpha particles are absorbed by a few cm of air, or aluminum foil only 0.006 cm thick

2) Beta particles - while having less ionizing power than alphas (because of much lower mass) have 100 times more penetrating power. A sheet of aluminum at least 3mm thick is need to absorb them.

3) Gamma rays produce little ionization since they have no electric charge but can pass through a block of iron a foot thick.

Typical Experiment using the Geiger-Muller Tube

1. After setting the high voltage supply to minimum high voltage, bring a beta source to within about 6 inches of the G-M tube.

2. Gradually increase the voltage until the counting just starts (as disclosed by the clicking sounds from the meter). This is the "starting potential" - so record the voltage at this point. (See Fig. 4)

3. Increase the voltage to a value 100V above the starting potential - this should provide operation near the threshold (See Fig. 4)

4. Adjust the distance between the radioactive sample and the Geiger tube until the meter reads about 4,000 cpm. (Leave the sample at this distance for the balance of the plateau curve determination)

5. After returning the meter switch to the CRM position, record the count rate at the starting potential. Tne record the count rate corresponding to a series of voltages about 50 V apart.

6. When the continuous discharge region is reached immediately reduce the voltage.

7. Plot a curve on graph paper using cpm as the y-axis and voltage as the x-axis, The end result ought to be similar to that shown in Fig. 4.



Another experiment:

Using a beta source, plot cpm as a function of distance between the source and counter. Note the extent to which the curve obtained obeys the inverse square law (i.e.g the intensity or rapidity of the count is inversely proportional to the distance of the detector from the source).


The half life of a radioactive source

Another application of the G-M tube is to find the half-life of a particular source or the activity (decay rate) - say at a place.

Practical Problem:

A Geiger-Muller tube measures the background count at a given place to be 20/min. Over a period of time, the readings below are then obtained after an unknown source is placed at the location.

Time hrs: (0) <->(6)<->(8)<->(10.5)<->(20)

Count/min: (120)--(70) -(60)--(50)--(30)


Obtain the corrected counts, determine the half -Life (T½) of the unknown source, and find the decay constant.

Solution:

First, we obtain the corrected counts by subtracting the background count of 20/m from each of the values above, to obtain:

Correct/cpm: (100)--(50) -(40)--(30)--(10)

We can easily see from inspection, that since the activity drops by half (from 100 to 50 cpm) in 6 hours, that 6 hrs is the half life.

Hence:(T½) = 6 h = 21600 s

This can also be verified by sketching a plot of the half life ((T½) ) on the vertical axis against the time in hours - to obtain the radioactive decay curve.

The activity A is found from:

A = ln 2/ (T½) = 0.693/ (21600s) = 3.2 x 10^-5 /s


Other Problems:

1) Sketch the radioactive decay curve for the practical problem and confirm that the half life is 6 hrs.

2) A point source of gamma radiation has (T½) = 30 mins. The initial count rate recorded by a G-M tube is 360/s. Find the count rate that would be recorded after 4 half lives. Sketch the decay curve and determine the activity, A.

3) At a certain instant, a sample of a radioactive material contains 10^12 atoms. The half life of the material is 30 days.

a) Calculate the no. of disintegrations in the first second.

b) The time elapsed before 10,000 atoms remain.

c) the count rate corresponding to the time in (b).

4) Find the half life of the beta particle emitting nuclide, 32P 15, if the activity A = 5.6 x 10^-7 /s.

Friday, July 8, 2011

A "Chained CPI"? Yes! For the CHAINSAW!


IN the 1990s, the über austerity and deficit hawk, Peter G. Peterson (the billionaire hedge fund owner and head of the 'Peter G. Peterson Foundation') had one major aim in mind which was to cut Social Security. Like the earliest enemies of FDR's program (see Max J. Skidmore's The Enemies of Social Security), he realized that direct cuts would be almost impossible to make - given the political popularity of the program - but if large enough deficits could be rendered, it might be possible to cut it "through the back door" and invoke deficits as an excuse. Thus, did he say "such a shining moment may not arrive again". Well, it did after the 2008 financial crash, delivering $800b in bank bailout, $900b in extended Bush tax cuts and $1.1 trillion more in two funding 2 "wars" (actually occupations).

In fact, this cutting already began two years ago with the elimination of the S.S. COLA, or cost of living adjustment, with the elites making the specious argument it couldn't be justified because the interest rates were so low, hence inflation was next to zero. It never occurred to these numskulls (or maybe it did) that seniors are in a different spending class given their ongoing medical and prescription needs, which costs have totally outpaced inflation!

Now being floated, and by a DEM President for cripes' sakes, is one of Pete Peterson's most famous (and earliest) proposed end runs for cutting Social Security: substituting the normal COLA (which as Sen. Bernie Sanders noted on Keith Olbermann last night was still below par) with a "CPI" (consumer price index) -based alternative, known as the "chained CPI".

By this new inflation measure, which reckons inflation (and hence adjustments) at barely one third of the original COLA, most seniors in the country will find themselves either dead or in the poorhouse - if it goes through! No, this is no fucking joke! Not with medical inflation increasing at a rate of nearly 14% per year!

So, despite the fact Social Security never contributed one red cent to the deficit, in order to show he's "bipartisan" (which Grover Norquist once described as "date rape" for Republicans) our bold and courageous DEM President is willing to give Repukes almost all the spending cuts they want (and then some - adding to nearly $4 trillion over ten years) in return for mildly allowing the Bush tax cuts to expire next year. Big fucking deal! Massive hurt and social catastrophe in return for a passive sunsetting of deficit-creating cuts that HE ought to have retired in December!

This "chained CPI" assumes that as prices increase, consumers will buy lower cost alternatives, reducing the amount of inflation they experience. (For example, if the price of stew beef or hamburger rises by 30 cents a pound, they'll opt for pork). BUT what these dingbats don't process is that this is fairyland, magical thinking! WHAT if both pork and beef prices increase and CHICKEN prices too? THEN WHAT?

Indeed, at the supermarket this a.m. I was rudely shocked to behold pork nearly as dear as beef! Maybe because the feds (again interfering) catered to Michelle Bachman's pleas for pork subsidies to thereby increase the cost, for her poor little Minnesota pork farmers! (Which MSNBC's Lawrence O'Donnell brilliantly described a fortnight ago as "socialism designed for Michelle Bachmann" and her toadies).

In other words, with the prospect of perpetual market interference for the big boys, whether oil, agriculture, banking or airlines...the rest of us are still fucked. What? We're then to opt to eat sardines every day? Wait, even their cost is rising! I suppose these geniuses expect us to eat seasoned sand or baked in the oven mudpies like they do in Haiti!

The other aspect, as Sen. Sanders observed last night, is that for seniors it isn't easy at all to find alternatives for high inflation products - since they're captives of the medical-industrial-pharmaceutical complex. Since our great government refuses to allow Medicare to bargain for the lowest cost drugs like the VA, those drug prices keep going up! Thus, it isn't like simply opting to buy a 33" LCD TV instead of a 55" flat screen HDTV! If you must have Lipitor, or some blood pressure meds, or others - say for depression - the total costs will ruin you if your total income is pared year after year by this "chained CPI" gimmick. (Which in the end is yet another evil product of the evil Pareto Distribution).

It's evil because as I showed in those two previous blogs (last month) on the Pareto and "Pareto efficiency", it regards the dollars of the wealthy and affluent as having more "utility" than the dollars of fixed income seniors, or the poor. Thus, in considering any option of whether to give more relief to fixed income seniors (who get their S.S. monies by simply existing and breathing every day) or the wealthy- who may invest it to buy yachts, $2 million 'Billy the Kid' tintypes, 50 Lamborghinis or blood diamonds, it's always better to give the money to the latter while letting the former suck salt, or pound sand. (Or jump off a cliff?) Since the "utility" of a senior dollar is only about one one thousandth of the utility of a buck from Jamie Dimon, it's much better to give Jamie big tax breaks (via tax cuts) than to preserve Social Security or a decent COLA for seniors! (Besides, Neoliberalism - such as both parties are now obsessively wedded to, disdains any financial security for the populace at the expense of their precious "free" markets - which can always use subsidies when they start 'malfunctioning', to keep the rest of us fucked to a far-thee-well!)

What does this change in COLA mean then? Basically smaller annual increases in Social Security payments, government pensions and veterans' benefits. (Current payments will not be affected but beneficiaries will get smaller payments in the future). As the potential cuts are phased in, a typical 65 -year old who opts for taking Social Security at 62 will get an annual reduction of $130 in his first year. In his second year, it will be $144. In his third year it will be $172 and in his fourth year, $186, and his fifth year, $200. Also at the end of this fifth year, a cumulative total $886 (for 5 yrs.) will have been lost by attrition, or equal to one month of his benefits.

By the time he's 85 the cut would be $984 a year and the total money lost by yearly attrition nearly $10,500.

That may well be $984 he'd originally have been able to use for food, meds, or heating oil which now won't be there! I suppose, given the hare-brained theory behind this Chained CPI, he will have to opt for more sweaters, fur parkas (if he has any) or - if push comes to shove- building small fires in his apt.! Now, if average Social Security benefits are curently $1,100 that means by age 85 the senior will lose nearly one month's worth of benefits as evaluated today, but assuming 4% yearly inflation, nearly 112% of what his monthly dollars will be worth THEN (e.g. $880). But, what if even worse inflation occurs such as seen during the Arab Oil Embargo? In that case, our senior's expenses (especially in food, heating oil) will be almost entirely consumed by the time he's 85, leaving him (in the case of 11% inflation as in 1973) with about $4,000 a year to manage all his expenses. Well, there's always the six chamber option!

There are also income tax implications if this idiocy gets passed. Low wage workers would see the biggest increases to their tax bills, with those (such as work at Mickey D's) and earning between $10,000 and $20,000/yr. seeing a 14.5% increase. Meanwhile, taxpayers earning more than a half million a year will see a 0.3% tax increase - maybe the difference between buying that new yacht or opting for one a year older!

Needless to say, this abomination and perfidy must be fought with all the force and intensity that we also used against Bush's (2005) attempts to privatize Social Security! It is sad we must inveigh against a (putatively) Dem president (though he does evince a disturbing fascination for major supply side tax cutter Ronnie Ray-gun) but there it is. We play with the hand we are dealt and we fight on the landscape presented. We didn't want this combat, but we're not going to roll over and allow it for some Neo-liberal political expediency.

Obama may well believe and think he can win many moderates next year for his display of "bipartisanship" - but it will not do him much use if his liberal base (the ones that ensured his win in 2008) don't show up, like they didn't last year. Never ever make the mistake of assuming that those voters are "yours" or have "nowhere to go". They do, which is to stay home if none of the choices appeal, and the prez they would have voted for has broken too many promises. And as we see through history, shat-on dems always - if they do vote- cast for real republicans as opposed to repub lite. (Exhibit A: The Reagan Democrats).

Re: the just announced 9.2% unemployment rate which bodes even worse for Obama. This is totally in line with the predictions I've already made (see blog before last) on the matter of lowered aggregate demand. BUT...if Obama allows or enables massive spending cuts to go through, thereby triggering more massive consumer demand pull back, that figure will absolutely soar - by multiple tenths each month not single tenths. As I have predicted, if $2 trillion in cuts to social safety nets is allowed, the ensuing crippling demand will engender 18% unemployment by next summer. No, this isn't a fairy tale like the alleged alternatives for seniors under the "Chained CPI" hammer.

Once more, we are in a poor demand environment! The solution therefore is NOT tax cuts...for ANYONE! It is pumping demand by MORE spending! YES KEYNSIAN ECONOMICS not retardo, NEO-liberal - Pareto Efficiency BULLSHIT economics!


We hope that, given this, Obama will rethink his plans and not give a sop so easily to Boner and his repukes! (Which one wit has compared to a kid giving up his lunch money before the bully even demands it. But then, this more and more appears Obama's modus operandi!) We do not want the Democratic brand damaged in perpetuity, as it will be if this revised "COLA" is enabled to pass!

Solutions to Part 24 (Oscilloscope Problems)




We now look at the solutions to the problems at the end of Part 24, starting with giving the problems again:

1) In a test of an oscilloscope the Y2 plate is connected to a positive (d.c.)potential, sketch what would be observed.

2) The time base is connected to a positive potential (X-plates only involved). Sketch what would be observed.

3) When the time variation of a quantity is to be studied, an alternating p.d. representing the quantity is applied to the Y-plates via the Y-amplifier to the time -base. This generates a "saw-tooth" pattern. Illustrate such a pattern, and label its "sweep" and "flyback" aspects.

(Hints: The sweep must be linear so the deflection of the beam is proportional to the time. The 'saw-tooth' results from a combination of the alternating input p.d. and the steady speed of the image spot going left to right)

4) Say a 2 cm long line (peak-to-peak, from above to below reference horizontal) is generated on the screen in a lab oscilloscope by an a.c. input of 60V. What would the peak voltage be? What will the rms voltage be?

5) A signal generator producing 1,000 Hz is connected to the vertical Y-input of an oscilloscope while a 2nd signal generator producing 500 Hz is connected to the horizontal. Sketch the Lissajous figure that would be produced. Explain why you sketched it as you did.

6) The frequency ratio analyzed from a Lissajous figure is found to be:

f(v)/f(h) = 1

Sketch how this pattern would appear on the oscilloscope screen.


Solutions:

(1) The CRO spot appears exactly as shown in Fig. 4 of Part 24.

(2) The spot is displaced to the top of the CRO screen, as in Fig. 4, but moves to the right side, e.g.


!
!_____________>>>>
!
!
0- - - - - - - - - - - -- - ----------
!
!
!


(3)The key step is to note from Fig. 3(b) how the sweep characteristic appears as a time-voltage vs. deflection. Thus, given the hint, the result is shown in the diagram for problem 3.

(4) For this CRO, 60V generates a 2 cm line, so peak voltage = 60V/2 = 30 V

The rms voltage is: V(peak)/[2]^½ = 30V/[2]^½ = 21.2V

(5) We need to obtain the numbers of tangency points in order to sketch the figure. We know:

f(v)= 1000 Hz, and f(h) = 500 Hz. Then:

f(v)/ f(h) = 1000 Hz/ 500 Hz = 2/1

But, the ratio of the tangency points is the inverse ratio of the input frequencies.

So T-points = 500/ 1000 = 1/2

In other words, there is ONE vertical tangency point, and TWO horizontal tangency points.

The result is sketched in the diagram for Problem 5.

(6) We have:

f(v)/f(h) = 1


The inverse of this also yields 1. Therefore there is one horizontal and one vertical tangency point.

The pattern is sketched in the diagram for Problem 6. It's a circle.