A 1.2-Ci 13755Cs source is used for 1.4 hours by a 62-kg worker. Radioactive 13755Cs decays by

Question:

A 1.2-μCi 13755Cs source is used for 1.4 hours by a 62-kg worker. Radioactive 13755Cs decays by β- decay with a halflife of 30 yr. The average energy of the emitted betas is about 190 keV per decay. The β decay is quickly followed by a γ with an energy of 660 keV. Assuming the person absorbs all emitted energy, what effective dose (in rem) is received?