72 EFFECTS OF IONIZING RADIATION Table 5.4.—Gross Beta Activity in Urine of People From Ailinginae and the Americans AILINGINAE Day 46 Post DETONATION Case No. 8 | \ |efingML MiteRS | | Age<5 yrs 8 44 Mean. ._...------ | Age 6-15 yrs | Mean. _.-...---.- 150 217 150 217 sein 1 28 | at 43 45 51 ” ° | | | | | 401 | 3 | | 5 6 | 8 ee 88 275, 126 nen hes 7 680 1202 om 10 850 oes 754 680 410 “ ~ Mean ---------- (2 | 0 400 2 | 1, 970 | I " 0 8248 +: 1,260 40 | 1,340 | 0 78 0 (osetteeee 14 : 15 16 19 / , i 550 353 1, 180 1, 160 1, 380 0 750 187 / | | Mean_._....._..- 830 q | 23 24 25 28 1,380 1,930 | 1,300 | é 965 438 720 | oo 28 1, 810 Beye I | 733 900 | weeeeee | : 820 1,410 20 | 1,224! | 385” || Yga0 9 1, 460 PO H 0 i 12 13 | | "650 | 7 ° 558 oeNes(uu | obrasRs 4 ; “° 720 29 | | 370 | 16 Cag No. | | 5381 AMERICANS Day 44 Post Detonation | 1, 070 | 466 0 323 5 OO —_—. 1, 220 1, 138 wien ee — 9 309 —_—_— Values corrected for decay. beta activity at 45 days post detonation (Table 5.5).° The predominant radionuclide is Sr®, which contributes 42 percent of the total beta activity at this time. Assays of fissile material nade on pooled samples of urine were all negative within expertmental limits. The early urine samples analyzed by the LAS(collected 15 days post detonation) contained fair amounts of radioiodine in addition to the alkaline and rare earths. On the basis of the radtochentical analysis of the urine, the body burden (the radioisotopic Qeposition in the tissues) was estimated. The ratio between the activity of the urine and the wmount of isotope fixed in the body is required for this calenlation. However, few ratios are available for the deposition of the various radioelements in humans, so Chaf it was necessary to utilize ratios obtained from animal studies. Of the animals collected on Rongelap, the pig wis selected as the closest to the human tn size and metibolism. A detailed study was therefore made on the excretion of these animabs and