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Most of the internal radiation of the human body is due to a single isotope, the...

Most of the internal radiation of the human body is due to a single isotope, the beta emitter 40K, with half life of 1.28×109 years. The body contains about 0.35% potassium by mass; of this potassium, about 0.012% is 40K. • What is the total activity, in Bq, of a 70 kg human? • Each 40K decay produces a 1.3 MeV beta particle. If 40% of the energy of these decays is absorbed by the body, what dose, and what dose equivalent, will a typical person (70 kg) receive in one year?

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