First of all Toshay...
My previous assertions were not 100% correct and I admit that they were based on gut recall and not actual research.
OK, so I chugged the numbers. I should have taken a few minutes to analyze what I posted last time before actually posting it.
I can't back it all up with links because I used actual books from my own collection and the library. Here is what I've got so far.
Here are definitions to some terms I will use later.
REM - Roentgen Equivalent Man is a unit of dose actually absorbed taking biological effects into account.
CEDE - Committed Effective Dose Equivalent is a dose estimate that is based on inhaling or ingesting a given amount of radioactive substance. The following calculations will use it to discuss a Whole Body dose but it could also be used to take sensitivities of different organs into account.
Curie - A unit of radiation activity. Think about it as an amout of energy. It's kind of like REM but REM takes into account the biological effects of that energy.
mrem = .001 rem = 1E-03 Rem
micro curie = .000001 curies = 1E-06 curies
pico curie =.000000000001 curies = 1E-12 curies
K = Elemental symbol for potassium, K-40 is a radioactive isotope of postassium.
Isotopes are different types of atoms of the same chemical element. Basically atoms that have the same number of protons but different number of neutrons.
The element potassium has several natural isotopes that exist in varying abundance. K-40 is an isotope of potassium that is unstable and radioactive.
So here are my revised claims:
1. Bananas - If you eat a banana per day for a year you will recieve a higher dose of radiation than if you live for 36 years near an American Nuclear Power plant. Here is how that works out.
OK. To give some context.
From the DOE the dose limit for the public is .1 rem/year. The local control levels are .025 rem/year...this means that the the federal guidelines allow .1 rem per year but local monitoring sets a lower limit for exposure to 25% of the federal limit. The reason they do this is because it is easily accomplished and will prevent exceeding any federal limits. The Nuclear Regulatory Commission provides oversight to monitor civillian exposure.
Those are the limits but they are not what a typical person living near a nuclear power plant will actually be exposed to.
In reality living near a nuclear power plant will actually result in less 1 mrem per year of exposure (See NRC). The real answer is probably closer to 0 than 1. But for the sake of argument lets say that it is 1 mrem per year and you spend 36 years of your life actually living near a nuclear power plant you would receive a dose of 36 mrem from that nuclear power plant.
In the CRD Handbook on Rad Measurement and Protection, the concentration of K-40 (a radioactive isotope of potassium, which is found in bananas) in a Banana is 3520 picocuries (or micro-micro curies if you prefer ;) ) per kilogram of banana. This equals 3.52E-6 microcuries of K-40 per gram of banana.
An average bananas mass is about 200 grams (Averaging several sources) So, a typical Banana contains about 7.04E-4 microcuries of radioactive K-40.
Federal Guidance Report number 11 says the ingestion dose (committed effective dose equivalent) for K-40 is 1.86 rem per microcurie ingested.
So, CEDE from ingestion of a Reference Banana is 7.04E-4 x 1.86 =1.3E-4 rem or just round it down to 0.1 mrem.
Let's say that you eat 365 bananas in a year. Therefore your CEDE due to K-40 in those bananas is .1*365=36.5 mrem
Basically eating a banana per day for a year gives you a dose greater than living near a nuclear power plant for 36 years.
2. According to the office of research services division a 5 hour airplane flight will result in an exposure of .5mrem/hour.
So the 2 hour flight from memphis to DC results in 1 mrem of exposure or equivalent of living near a nuclear power plant for 1 year.
I'm sure that the more technically minded among you may find flaws in the math but that's all the effort I feel like putting forth right now.
If you really need a link then follow this one.
http://www.epa.gov/rpdweb00/docs/402-k-07-006.pdfI know it is made by the evil EPA but my point is that the risks due to radiation exposure from American nuclear power are low.
I don't feel like arguing anymore tonight. I freely admit that my previous claims were bogus and based on my gut recall and not on actual research. These numbers are better but probably not perfect.