Table 0.4 Physiological Factors in Dos imetry Factor (adult) Physiological half-life? Radionuclide Cesium-1375 Fraction absorbed from gut ] Strontium-904 0.3 P lutonium-239, 2404 Americium-2414 whole-body (days) 110 (90%)¢ 2 (10%) bone (years) liver (years) -- -- -- 3.2 - 0.0001 -- 100 40 0.0005 -. 100 40 4 Time for 50% of the element to be gone as a result of excretion. b Reference 16. © For men 90% of the intake is in the compartment with a 110 day half-life and 10% in the compartment with a 2 day half-life. compartment has an average half-life of 87 days. d Reference 31. this value. soggi24 For women the long term For children the physiological half-life is about 1/3 of D-23