Internal dose calculations for electrons and beta particles

A computer code was developed for the transport of photon and electrons in an improved mathematical reference man. The code generated absorbed fractions of energy for monoenergetic electrons for selected source organs. The organs or regions considered were those with high surface to volume ratio, organs with walls, and organs that have subdivisions. The calculated absorbed fractions for electrons superseded the values specified by the Medical Internal Radiation Dose (MIRD) methodology. New estimates of S-values for eighty radionuclides were calculated using the new electron absorbed fractions for 21 combinations of source-target regions. Revised S-values were compared with those presented by MIRD Pamphlet No. 5 Revised.;An assumption used in the calculation of S-values was the use of the average energy of the ;The EGS4 code was used to calculate absorbed doses to the circulatory system. Absorbed doses per transformation per cm...