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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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