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Dental Geek Dental Geek
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6 years ago
How do you work this problem?
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6 years ago
We have Potassium 40

I believe this might help:

Potassium has three isotopes, of which potassium-40 is radioactive and provides the basis for the determination of the age of rocks between 105 and 109 years old, i.e., those formed in proterozoic and cenozoic periods of geological time. The decay of potassium-40 occurs with a half life of 1.31 x 109 years, by two routes. That associated with a beta particle decay accounts for 89% of the decay:

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Source  http://archive.cnx.org/contents/f6f11514-f5ab-4b32-9d05-8dff0c68ce31@2/the-alkali-metal-elements#id1170896090392
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