~ > wet KS on wh vaieetegone tats 2S cecemeanate 1 eras. Sakae ey elle awnelin me he -4- where fwa = fraction of ingested Sr% which is retained by Io = pe of sr ingested in U.S. = 6 x 10! kg x ' poedy. Assume 0.3 (From reference 4). sr™ content of milk (assume 1 ype/ke) (See reference 5). Teff 2 bh, o = ore jab ¥4 = 604 x 10? days. % E(RBE)N bone = 1.1 (See yeference 6). _ uw Mt ~ 2330 9% t = 35 x 365 days. Based on average life span of m =7x10 grams for an average adult. 70 years mimus average age of population, 35 years. 1h x 0o3 x6 x10 x1 x 6.4 x10 x 1el x 0675 x 107° 7x10 = 106 rens for 1 pye/ke of sx? only for l year. But since sr cannot be kept free of Y%, which has a half life of 65 hours and would therefore come to equilibrium rapidly (400-500 hours) compared to the exposure time (t) of 35 years, we mist repeat the calculations for Y™ dose. However, since the only difference in the two calculations is the value for ZB(RBE)p for Y™” of 4e4 as opposed to that for sr”? of 1.2, therefore if sr dose the Y* dose totel dose > fale a5 tN ny Then the equation becomes: Drens . 1x 10° rens hel x 10° rens and the ee eersteae ae 544, x 10° rens/1 pye/ke of Sr? in milk, or |