**Table 2, Radionucl* "2s to be expected in the Bnivetck Environment _ Isotope pbhys 1/2 (days) ff, Typ — . Emission Critical Organ Energy (MeV: DEF (RBE) 3H 5x10 12 Bo W.B. 0.0063 Uk, 2x10° 12 B” Sol. Fat 0.054 Submersion W.B. 0.05% Sol. spleen 0.0065 10 Fe 1.1x10° 600 e(x-ray) 3.2x10° 60,, 1.9x107 63y5 9.5 2.9x10" Insol. Lung " Insol. GI " Sol. W.B. 1.5 Sol. GI 0.44 Insol. Lung 0.72 Insol. GI 0.44 Sol. Bone 0.11 Insol. Lung 0.021 Insol. GI 0.021 — Sol. Bone ll Insol, Lung 1.1 Insol. GI 1.1 W.B. 1.2 B™, B* WB. 0.39 Bsr Sol. W.B. 0.34 Sol. Bone 0.69 By 800 6 . 9c, ro! 6.4x10° 102en 1.06x10° 10.4 102p), 206 10.4 1259, 876 B e(x-ray) 38 100 . Sol. GI 100 Sol. Lung 100 Insol. Lung , 137o5 WTp, 1.110" 920 70 138 ” 570 ~ YB " B Sol. W.B. 0.59 Sol. Bone 0.35 Insol. Lung 0.06 ‘Insol. Lung Insol. GI Sol., Insol. GI ex ADE et tae 0.26 Insol. GI ‘~..... SO Half-life in man following uptake in tissue Effective energy for deposition in human tissue. KKK 0.23 Ahhrevi atinn« O.41 0.34. 0.069 a1 (includes active decay products) aT (Gastrointentinal tract). W.B. (Whole hodv).