(14.) A lifetime dose equivalent of 500 mSv is associated with a high risk of developing cancer. A man, mass 90 kg, lives in the part of the country where the activity, energy per decay, and RBE of the naturally occurring background radiation are as given in the table below. Assuming that all of these values are constant, should the man worry about developing cancer in his lifetime due to background radiation only? For full points, you must defend your answer using correct numerical calculations. (+10pts) Isotope Information Activity 1 Bq Energy per Decay $6 \times 10^{-14}$ J RBE 1.4
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