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AN IN SITU GAMMA-RAY SPECTROMETRY INTERCOMPARISON

Abstract— This paper provides the results of an in situ gamma-ray spectrometry intercomparison that was held from 18–21 October 1999, in Grand Junction, CO. This intercomparison was a collaborative effort between the U.S. Department of Energy’s Environmental Measurements Laboratory and the U.S. Environmental Protection Agency’s Office of Radiation and Indoor Air. It featured measurements of a background location and the Walker Field Calibration Pads. In this paper, the in situ gamma-ray measurements of the background location were compared to soil samples, and the in situ measurements of the Walker Field Calibration Pads were compared to corrected reference values. The results showed that 84% of the in situ gamma-ray measurements of 226Ra, 232Th, and 40K at the background location fell within 20% of the soil sample mean. Similarly, in situ gamma-ray measurements of the Walker Field Calibration Pads showed that 77% of the in situ concentrations fell within 20% of the corrected reference values.