TABLE 3. #1 SOURCES OF FALLOUT RADIATION Radionuclide Halflife*/ Principal Radiations*®/ b/ Years cf eed/ MeV MV A ff FF MeV Cesium-137 * 30 - Strontiur9 2 ~- Plutcniun? + Fraction absorbed 0.187 . 1.13 -239 ; 24,065 5.23 - -240 6,537 5.24 - 432 5.57 from gut in ultse’ .66 1.0 - 3 - 001 - 01 - .001 . Annual dose (rem) per pCi/g in tissuef/ soft tissue bone marrow .010 .009 - -005 1.93 0.63 1.93 0.63 2.06 0.68 (muscle) (liver)j (liver) Americium * 4 241 a/ ICRP Publication 38. b/ Quality factor, 2. ¢/ Quality factor, 1. - (liver) (Radionuclide transformations) 4/ X and gamma rays are amitted whose total contribution to dose would be less than 14. */ ICRP Publication 30. Supplement to Part 1. (1980), and ICRP Publications 48 and 51 for transuranics. transuranics. The half-retention time in liver is 20 years, in skeleton 50 years for the Kr */ Dose in 1 year for an activity of 1 pCi/g maintained for that year in the tissues which receive the highest dose when the radionuclide is ingested. (Reference, See Footnote */.) * The half-life in the body is about 110 days in males, 85 days in female, and much less in pregnant women and children. ** The half-life in bone marrow and liver together averages about 35 years. 21 9000528