73 INTERNAL DEPOSITION OF RADIONUCLIDES Table 5.5.—Radiochemical Analysis of Urine From the Rongelap People (45 days post detonation) | Beta Activity—p/m/24 Hocr sem | we RauRate “Oremgars| | | | SAMPLE NO. | Loe eee eee eee eee ee ee eee eee eee ee | Qo eee cee eee eee Boone eee eee eee ee eee | Qo eel eee ence eee | Boonen een eee eee eee eee 6.222 e one ee eee eee | Average........------------- eee nee | Percent of total Beta activity... ..-.-- | on the radioactive content of various tissues. Details of the animal study are presented in a subsequent section. The estimate of the mean body burden of the Rongelap group at 82 days post detonation is presentedin Table 5.6. The body burden at one day wus calculated in the following manner. A. formula was obtained from urinary excretion data reported by Cowan, Farabee and Love (6) in a case of necidental inhalation of Sr”. The excretion curve was best represented by four exponential terms. (Very similar results were obtuined by approximating the biological deeay of strontium with a power function, based on human excretion of the metabolically similar element, radium) (6, 7, 8). Estimates were made of other radioelements \ 1370 1260 | 490 510 | | 1020 1210 1460 1200 | 480 | 626 328 727 1253 | #5268; | t 100 | | | | 42 | ° 1200 130 | 120 150 10 170 (197 244 | | 324 284 474 353 | 134 312 10,7 25. 5 present in signifieant amounts at one day, as shown in Table 5.6. These estimates were made on the basis of the level of Sr? at one day, towether with the data on the activity of the various fission products at this same time (9) and animal isotope absorption and retention data (1, 5). The LASELhas also estimated the body burden at one day, on the basis of radiochemical analysis of pooled urine sanmiples from a representative number of the Rongelap and Amerteau groups (10). These calculations were based on the analysis of L'' in the early samples of urine (15 days post detonation) as well as the above mentioned physical and biological data on fission products (1.5,9). Their tiadings ave presented in Table 5.6. Table 5.6.—Mean Body Burden of the Rongelap Group ACTIVITY AT #2 Days Rabtorsororg ue (USNRDL) Sr®_ oe le Bal? = de Rare earth group. _.._.-- 13 (in thyroid). .22-22 2 ee RulB ee Ca.) ee. Fissite material... 2... 281712 O—56—6 , j ACTIVITY AT 1 Day ms (USNRDL) O19 16 0. O21 0. 03 27 1.2 0 6, 4 — — 0 0 0 : 0 - ACTIVITY 4 fray 4T ue (LASSE) 22 0. 34 ,o7 , 1 1 1b2 0, O88 OW 0, O86 (agin)