SLIDE 20 Radioactivity in excreta. Urine samples for 24-hour elimination were pooled and collected on the |7th day post detonation from persons evacuated from Rongelap Island (Co72). The urine was sent to Harris at Los Alamos Scientific Laboratory and an estimate of thyroid absorbed dose from internal emitters was reported by Cronkite (Cr56). The 64-person composite urine sample was 75% adult urine (18 ( , >16 years of age), 20% adolescent and child urine (4.8¢ , 5-16 years of age) and 4.8% child and infant urine (1.24 , <5 yeqrs of age) (64). Harris indicated a mean activity of 0.48 kBq (1.31 x 10 “Ci) of I in the Rongelap adult 24-hour urine taken oy, the 17th day post detonation (Co72). The adult mean peak thyroid content of I was estimated by Harris to be 414 kBq (11.2 pCi) based on these urine samples (Ha54). This estimate was calculated on the assumption that 0.1% of stable iodine burden on the first day would be eliminated via the urine between the 15th and 17th days (Co72). Cronkite (Cr56) reported 895, and 1403, urine activity excretion on day 45 post detonation forgix adults from Rongelap_ sland. The mean urine gepivity excreted for ““§$r was 8.9 Bq (2.4 x 10 Ba, 2.2 Bq (6.0 x 10 (Pet) on day 45. feed) on day 45 and for RADIOACTIVITY IN EXCRETA (RONGELAP) Adult Mean Day Post Nuclide “ol Sr Ba Detonation Urine Was Collected _ i Activity Excreted In One Day Bq 480 45 8.9 45 2.2 25