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31.5 Exercise 22

Avg difficulty 2.5

Data from the appendices and the periodic table may be needed for these problems.

A 5000-Ci 60Co^{\text{60}} \text{Co} source used for cancer therapy is considered too weak to be useful when its activity falls to 3500 Ci. How long after its manufacture does this happen?

OpenStax College Physics 2e, 31.5 Half-Life and Activity, exercise 22

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.