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The disintegration rate for a sample con...

The disintegration rate for a sample containing `""_(27)^(60)Co` as the only radioactive nuclide, is found to be 240 atoms/minute. `t_((1)/(2))` of Co is 5.2 years. Find the number of atoms of Co in the sample. How long must this radioactive sample be maintained before the rate falls to 100 disintegrations/minutes

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`9.6 xx 10^(8)`, 6.6 years
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RC MUKHERJEE-ATOMIC STRUCTURE AND RADIOACTIVITY-PROBLEMS (Answers bracketed with questions)
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