The half-lives of cobalt-60 and strontium-90 are 5.3 years and 28 years,respectively.Suppose that samples of cobalt-60 and strontium-90 are such that they initially have the same activity.What will be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples?

Question

Quizplus · Accepted Answer

Since the half-life of strontium-90 is longer than that of cobalt-60, for the same initial activity, there must be more strontium-90 nuclei to compensate for its slower decay rate.

The Half-Lives of Cobalt-60 and Strontium-90 Are 5