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Sample containing ""(88)^(234)Ra, which ...

Sample containing `""_(88)^(234)Ra`, which decays by `alpha`-particle emission, is observed to disintegrate at the following rate expressed as counts per minute (cpm). Calculate half-life of this nuclide. t=0, 1000 cpm, t=1h, 992 cpm, t= 10h, 924 cpm, t=100h, 452cpm, t= 250h, 138 cpm

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RC MUKHERJEE-ATOMIC STRUCTURE AND RADIOACTIVITY-PROBLEMS (Answers bracketed with questions)
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