Methods of Dose Calculation The external cose measurements and calculations irom gamma-emitting ws aay . . 137 a . radionuclides, primarily cS ana 50. . og . Co, sodei caicuiates cy factor “OF) the dose with a quaior 1 without he use cian factor ror nonuniform distri>urion in the bone. distributed in the soil on Bikini and Eneu Islands nas deen Under these conditions the bone marrow doses 4 described in detail.” snouid be compared to the 0.5 rem/yr Previous studies of the aged fall1 8 in the Marshall Islands and the out’ guideline for members of the public anaiytical data reported here indicate used if mineral bone doses are cal- chat only 60., ’ 905, ’ 137o, ’ 241 4. An, rather than the 3 rem/yr criteriale”}8 culated using an ~ factor of 5, 2915 239,240 and plutonium isotopes contribute co The done liver doses of the internal dose. caiculated using the ICRP lung The doses resuiting 19,20 from the inhalation and ingestion of and the most recent param- these nuclides have been calculated eters for transfer from the lung, using the most recent models, across the gut wall, and for retenrion 19,21 A transfer coefficients, and turnover times avail- able. The dose from % was based time in the critical organs. summary description of this model and upon a single-exponential model with a associated transfer and retention biological half time of 10 da.? coerficients is given in a recent The transfer across the gut to whole body was taken as 0.3. For 137 Cs a two- component exponential function was used. paper by Martin and Bloom. °2 Table 4, ALL of the 1376, ingested is assumed to reach the whole body. Of the total 13764 reaching the body, Disintegration energy (E) and fractional deposition (F) in reference organ of five major radionuclides. 152 has a biological half time of 1 da Whole Body Bone Liver E, MeV re F F. 1370, 0.59 - - 1.0 The doses 905, lel 0.3 - - from 905, in this report are given for 60¢4 9 0.87 _ - 0.3 and 85% has a biological half time of 115 days. 1° The critical organ for 905,-dose calculation is bone marrow. bone marrow and are calculated by the method developed bySpiers/?713 and 14 used in the UNSCEAR reports. This Radionuclide 239.2405, 53° 1.35(-5) 1.20(-3) “Numbers in parentheses indicate.powers of 10, i.e., (-5) indicates <x 107: