Cobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a
Chapter 21, Problem 21.35(choose chapter or problem)
Cobalt-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. (a) If an original sample was purchased in June 2006, when will it be necessary to replace the cobalt-60? (b) How can you store cobalt-60 so that it is safe to handle?
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