ch42-p067 - 67. The decay rate R is related to the number...

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67. The decay rate R is related to the number of nuclei N by R = λ N , where λ is the disintegration constant. The disintegration constant is related to the half-life 1/2 T by ln 2 ln 2 RT R N T λ =⇒ = = . Since 1 Ci = 3.7 × 10 10 disintegrations/s, N = ×× 250 37 10 2 7 8 64 10 2 311 10 10 1 4 18
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