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Reply #42: OMG!! COME QUICKLY!! WOLVES ARE EATING MY SHEEP!! [View All]

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NutmegYankee Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Dec-02-09 09:29 PM
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42. OMG!! COME QUICKLY!! WOLVES ARE EATING MY SHEEP!!
Just Kidding...


Did you know that Potassium K40 (0.012% abundance) is radioactive with a half life of 1.25 billion years. You take it in every time you eat a banana or potato. K40 occurs in natural potassium (and thus in some commercial salt substitutes) in sufficient quantity that large bags of those substitutes can be used as a radioactive source for classroom demonstrations. In healthy animals and people, K40 represents the largest source of radioactivity, greater even than 14C. In a human body of 70 kg mass, about 4,400 nuclei of K40 decay per second.<6>


Even worse than Strontium 90, since you need potassium to live.

Cheers
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