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ATSDR's evaluation of iodine-131 releases from the Oak Ridge Reservation : a summary
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Feb 28, 2008
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Description:In 1942, the federal government established the Oak Ridge Reservation (ORR) in Tennessee’s Anderson and Roane Counties. By 1943, the government had built the X-10 site on the ORR.
Known formerly as Clinton Laboratories, X-10 was a pilot plant to show how plutonium could be produced and separated. From 1944 to 1956, a major effort at the X-10 site was the production of radioactive lanthanum (RaLa). During the RaLa manufacturing process, a byproduct known as radioactive iodine was released into the air, primarily from the dark-colored stack shown in Figure 1. The RaLa manufacturing process was the most significant source of iodine131 (I-131) releases at the ORR.
In an effort to determine the extent of I-131 releases from ORR’s X-10 site, in July 1999 the Tennessee Department of Health (TDOH) released the Reports of the Oak Ridge Dose Reconstruction, The Report of Project Task 1: Iodine-131 Releases from Radioactive Lanthanum Processing at the X-10 Site in Oak Ridge, Tennessee (1944-1956)—an Assessment of Quantities Released, Off-Site Radiation Doses, and Potential Excess Risks of Thyroid Cancer (referred to as the Task 1 report). The Task 1 team reviewed historical records of RaLa operations at the X-10 site and estimated I-131 releases from 1944 to 1956. The models developed by the Task 1 team predicted that I-131 releases were most highly concentrated in the communities of Gallaher Bend and Bradbury, downwind of the X-10 site. The maximum concentration of I-131 in these communities was predicted to be about 5.5 picocuries per cubic meter (pCi/m3) in air—about four times higher than the I-131 airborne concentrations measured in the city of Oak Ridge.
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orr_iodine_nontech-factsheet_508.pdf
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Pages in Document:4 numbered pages
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[PDF-732.22 KB]
