Iridium has two stable isotopes, iridium-191 and iridium-193. Iridium-192 sample was prepared from iridium-191 by bombarding with neutrons. Initially, its activity (B emission) was 7540 dpm. Measuring radioactivity over time produced the data below. Determine the half-life of iridium-192. Activity (dpm) Time (days) 7540 7060 7 6610 14 4460 56 3840 72 t1/2 = days %3D

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