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Naturally occurring ⁴⁰K is listed as responsible for 27 mrem/y of background radiation. Calculate the mass of ⁴⁰K in grams that must be inside the 51 kg body of a woman to produce this dose. Each ⁴⁰K decay emits a 1.32 MeV β, and 44% of the energy is absorbed inside the body.

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