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Naturally occurring ⁴⁰K is listed as responsible for 24 mrem/y of background radiation. Calculate the mass of ⁴⁰K in grams that must be inside the 45 kg body of a woman to produce this dose. Each ⁴⁰K decay emits a 1.32 MeV β, and 42% of the energy is absorbed inside the body.

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