In routine gamma-ray spectroscopic analyses of collected soil samples, procedure often calls to remove soil moisture by
oven drying overnight at a temperature of 100¡C [1]. Oven drying not only minimizes the gamma-ray self-attenuation of
soil samples due to the absence of water during the gamma-ray spectroscopic analysis, but also allows for a straightforward
calculation of the speciÞc activity of radionuclides in soil, historically based on the sample dry weight. Because
radon exhalation is strongly dependent on moisture [2,3], knowledge of the oven-drying time dependence of the soil
moisture content, combined with radon exhalation measurements during oven drying and at room temperature for
varying soil moisture contents, would allow conclusions to be made on how the oven-drying radon exhalation rate
depends on soil moisture content. Determinations of the oven-drying radon exhalation from soil samples allow
corrections to be made for the immediate laboratory gamma-ray spectroscopy of radionuclides in the natural uranium
decay chain. This paper presents the results of soil moisture content measurements during oven drying and suggests
useful empirical Þts to the moisture data. ( 1999 Elsevier Science B.V. All rights reserved.
In routine gamma-ray spectroscopic analyses of collected soil samples, procedure often calls to remove soil moisture by
oven drying overnight at a temperature of 100¡C [1]. Oven drying not only minimizes the gamma-ray self-attenuation of
soil samples due to the absence of water during the gamma-ray spectroscopic analysis, but also allows for a straightforward
calculation of the speciÞc activity of radionuclides in soil, historically based on the sample dry weight. Because
radon exhalation is strongly dependent on moisture [2,3], knowledge of the oven-drying time dependence of the soil
moisture content, combined with radon exhalation measurements during oven drying and at room temperature for
varying soil moisture contents, would allow conclusions to be made on how the oven-drying radon exhalation rate
depends on soil moisture content. Determinations of the oven-drying radon exhalation from soil samples allow
corrections to be made for the immediate laboratory gamma-ray spectroscopy of radionuclides in the natural uranium
decay chain. This paper presents the results of soil moisture content measurements during oven drying and suggests
useful empirical Þts to the moisture data. ( 1999 Elsevier Science B.V. All rights reserved.
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