21. Nuclear Chemistry
Radioactive Half-Life
6:01 minutes
Problem 37
Textbook Question
Textbook QuestionCobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a radiotherapy unit must be replaced when its radioactivity falls to 75% of the original sample. If an original sample was purchased in June 2016, when will it be necessary to replace the cobalt-60?
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