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Potassium-40 - Wikipedia, the free encyclopedia
Potassium-40 is the largest source of natural radioactivity in animals and people. An adult human body contains about 160 grams of potassium, of which a small fraction is potassium-40. From the isotope abundance and half-life it can be calculated that this produces about 300,000 disintegrations per minute continuously throughout the life of the body.

That's 5,000 Bq of K-40.

By comparison,

As Jake says, both the bata and the gamma decays of Caesium 137 are less energetic than those of Potassium 40. And we're talking about 5 billion times more decays from K-40 in a human body than from Cs-137 in a cubic metre of air.

So, in what may be my last act of "advising", I'll advise you to cut the jargon. -- My old PhD advisor, to me, 26/2/11
by Carrie (migeru at eurotrib dot com) on Tue Mar 29th, 2011 at 04:49:07 AM EST
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