Dr. Bugher lay 13,- 1958 Calculations of Dose to Thyroid yp Assume: inhalation and/or ingestion of Sx 103 fissions At D1 there are 0.017 d/m/10 “OO fissions or 8.5 x 10! d/a/S x 108 fissions or 38.3 pe intake of 1131 or1.4 x 1012 atoms intake of2. (Average energy 0.22 Nev) pose (reps) = —(1:35_2 dor Hriosz2N(2.6 x 197) = 255 eps # Correction for biological decay. pise Assume: inhalation and/or ingestion of 5 x 10 £9 ssions at D4 1, 12 intake is 1.1 x 10 etons The average sean energy of yi32 4s about 0.55 mev or 2.5 times that of yl, Thus, the energy equivalent to 1131 would be (2.1 x 10")(2.5) = 2.75 x 10% atoms of 1232 However, due to the short half-life of yis2 (2,4 hrs) assupe that the energy equivalent of 1.5 x 10** atoms of 1431 reaches the thyroid. 1 Thus, the ratio of doses rz 9.0 “me “> Panton tha te 12