The radioisotope cesium-137 has a half life of 25.00 years. A sample decays at a rate of 192.0 counts per minute (192.0 cpm) in the year 2000. In what year will the decay rate be 3.000 cmp?
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Expert's answer
2020-11-14T13:58:35-0500
It will take 6 half-lives to reach 3 counts per minute.
Multiplying: 25 x 6 = 150 years (The length of time it will take)
2000 + 150 = 2150 - this is the year in which the decay rate will be 3 counts per minute.
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