Methods of Dose Calculation The external dose measurements and model calculates the dose with a qual- calculations from gamma-emitting dry factor (QF) of 1 without the use radionuclides, primarily 37 C5 and 60 Co, distributed in the soil on of an m factor for nonuniform distribution in the bone.-> Bikini and Eneu Islands has been conditions the bone marrow doses described in detail.” should be compared to the 0,5 rem/yr Previous studies of the aged fall- Under these guideline for members of the public out? in the Marshall Islands and the rather than the 3 rem/yr criteria’ +8 analytical data reported here indicate used if mineral bone doses are cal- that only culated using an m factor of 5,249 60, > 906) > 137A, , 241 An, 239,240 Pu and plutonium isotopes contribute to The bone liver doses of the internal dose. calculated using the ICRP lung The doses resulting were from the inhalation and ingestion of model 19,20 and the most recent param- these nuclides have been calculated eters for transfer from the lung, using the most recent models, transfer across the gut wall, and for retention coefficients, and turnover times avail- time in the critical organs, 1777+ The dose from able. I summary description of this model and 96, was based upon a single-exponential model with a associated transfer and retention biological half time of 10 da.’ coefficients is given in a recent The transfer across the gut to.whole body 13/7 was taken as 0.3. For paper by Martin and Bloom. “- Cs a two- component exponential function was used. Table 4, All of the 13766 ingested is assumed to reach the whole body. Of the total 13765 reaching the body, Disintegration energy (E) and fractional deposition (F) in reference organ of five major radionuclides, 15% has a biological half time of 1 da Bone Radionuclide and 85% has a biological half time of 115 days, 1° The critical organ for 0c) dose calculation is bone marrow. from 90 The doses . . . Sr in this report are given for F B 13765 0.59 = _ 1.0 206, 1.1 0.3 _ _ 600, 0.87 — - 0.3 used in the UNSCEAR reports. 4 of 10, i.e., 53° a 1.35(-5) 1.20(-5) “Numbers in parentheses -1l1- Whole Body F 239,240, This Liver E, MeV bone marrow and are calculated by the 11-13 method developed by Spiers and Mmm gs | A — indicate powers (-5) indicates x 10 “>