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Project Name: Control1 ed Environmental Radio iodine Tests Date Terminated: November 1965 Objective(s)of Project : To obtain quantitative information on the kinetics of radio iodine transport from the point of release to the atmosphere through the entire air - vegetation - cow - milk sequence inthe human food chain. Short Description : The preliminary experiment was conducted during May and June atmospherically, and deposited on pasture area down wind from the release point. Six dairy cows were placed on the contaminated pasture and seven human volunteers consumed portions of the resulting contaminated milk over an 18-day period.Full details of the experiment have been published in IDO-12035. During September 1964, approximately the same quantity and chemical form o f Iodine - 131 was atmospherically released to an area designated the Experimental Dairy Farm located on the INEL (approximately seven miles northeast of the Idaho Chemical Processing Plant). Three human volunteers were on the test area during the time of cloud passage and were later subjected to inhalation thyroid dose measurements. Full details of this experiment have been published in IDO-12047. The experiment was conducted near the southern boundary of the INEL During November 1965, the 1964 experiment was repeated using simi1ar quantities and forms of Iodine - 131inthe same area. Seven volunteers were seated in the test area next to high volume air samplers to correlate inhalation uptake with the amounts of iodine present in the air.Ful1detai1s of this experiment have been published in IDO-12053. Follow - up Data : Due to the relatively short half - life of Iodine - 131(eight days) and the low thyroid doses received by the human volunteers(ingestion dose, range 230 t o 630 mrad; inhalation dose, range 6.1 t o 15 mrad) no fol low-up data a quis it ion was considered necessary.
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1. IDO-12035, "Control 1 ed Environmental Radioiodine Tests a t the National and Safety Division, ID-AEC, and N.F. Is litz er, U.S. Weather Bureau, Issued 2. IDO-12047 , "Control 1 ed Environmental Radioiodine Tests a t the National Reactor Testing Station, 1965 Progress Report," C.A.Haw1 ey, Jr., Editor, Health and Safety Division, ID-AEC, Issued February 1966. 3. IDO-12053, "Control 1 ed Environmental Radioiodine Tests, Progress Report #Two," D.F. Bunch, Editor, Health and Safety Division, ID-AEC, Issue August Attachment( SI: References attached.