ch42-p039 - 39. The number N of undecayed nuclei present at...

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39. The number N of undecayed nuclei present at any time and the rate of decay R at that time are related by R = λ N , where λ is the disintegration constant. The disintegration constant is related to the half-life T 1/2 by λ = (ln 2)/ T 1/2 , so R = ( N ln 2)/ T 1/2 and T 1/2 = ( N ln 2)/ R . Since 15.0% by mass of the sample is
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