People Are Radioactive, That’s Why We Can’t Stand Them
July 11th, 2007
Filed under: Uncategorized
In your body, most of the radioactivity comes from the decay of atoms of potassium-40. Most potassium is potassium-39 and has 19 protons in its nucleus accompanied by 20 neutrons. A very small fraction, about 1.2 percent, has an extra neutron and is called potassium-40. On average, if you start off with some potassium-40, it takes about 1.3 billion years for half of it to decay, so it’s not really very radioactive and in any case you haven’t got much in your body.
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