Question: A source contains two phosphorus radionuclides, 32P (T1/2 = 14.3 d) and 33P (T1/2 = 25.3 d). Initially, 10.0% of the decays come from 33P.

A source contains two phosphorus radionuclide’s, 32P (T1/2 = 14.3 d) and 33P (T1/2 = 25.3 d). Initially, 10.0% of the decays come from 33P. How long must one wait until 90.0% do so?

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