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Dosimetry of 129Cs and 131Cs

In a recent article, Anger and Sodd (see abstr. A81171 of 1971) calculated the radiation dose to various organs and to the total body after an intravenous injection of 1 mCi of 129Cs and 131Cs, respectively. The author wishes to point out that their calculations and assumptions, though sufficiently accurate in the case of the total body radiation dose are in error for the individual organs since the radiation dose to a given organ arising from the penetrating radiation of the radioisotope distribution in the rest of the body has not been taken into account. Anger and Sodd agree with Chandra's criticism.