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A radioactive counter gave a reading of 384 min-1 for a 13.9 mg sample of cobalt(II)...

A radioactive counter gave a reading of 384 min-1 for a 13.9 mg sample of cobalt(II) chloride partially enriched with cobalt-60 (t1/2 = 5.2 yr). What percentage of the cobalt atoms is cobalt-60? percent

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