The number of K 40 nuclei in a body with half-life equal to 1.28 × 10 9 years . The total beta energy absorbed in a year is 9 .68 × 10 − 3 J , the mass of body is 80 kg and 1.4 MeV of energy is deposited per decay.

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Chapter 29, Problem 55P

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The number of K40 nuclei in a body with half-life equal to 1.28×109 years. The total beta energy absorbed in a year is 9.68×10−3 J, the mass of body is 80 kg and 1.4 MeV of energy is deposited per decay.

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