State Background Radiation Levels: Results of Measurements Taken During 1975-1979.
Myrick, T E [ORNL, MMES, Inc., Oak Ridge, TN
(US)]; Berven, B A [ORNL, MMES, Inc., Oak Ridge, TN
(US)]; Haywood, F F [ORNL, MMES, Inc., Oak Ridge, TN
Ra-226, Th-232, U-238; background radiation, ORNL; contamination; gamma-ray exposure; sampling, radionuclide; sampling, uranium
DOE INFORMATION CENTER 1 Science.gov Way, Oak Ridge, TN 37831; Eva Butler; Phone: 865-241-4780; Toll-Free: 800-382-6938, Option 6; FAX: 865-574-3521; Email: email@example.com
Science and Technology\Geology, Hydrology, Seismology, Site Studies
1981 Nov 30
Originating Research Org.:
Martin Marietta Energy Systems, Incorporated
OpenNet Entry Date:
1998 Sep 01
This document concerns the state background radiation levels: results of measurements taken during 1975-1979. Background radiation levels across the United States have been measured by the Off-Site Pollutant Measurements Group of the Health and Safety Research Division at Oak Ridge National Laboratory (ORNL). These measurements were conducted as part of the ORNL program of radiological surveillance at inactive uranium mills and sites formerly utilized during Manhattan Engineer District and early Atomic Energy Commission projects. The measurements included determination of Ra-226, Th-232, and U-238 concentrations in surface soil samples and measurement of external gamma-ray exposure rates at 1 m above the ground surface at the location of soil sampling. This information is being utilized for comparative purposes to determine the extent of contamination present at the survey sites and surrounding off-site areas. External gamma-ray exposure rates were found to range from less than 1 to 34 uR/h, with a U.S. average of 8.5 uR/h. The nationwide average concentrations of Ra-226, Th-232, and U-238 in surface soil were determined to be 1.1, 0.98, and 1.0 pCi/g, respectively. Tables and figures are included in this report.