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:: Volume 18, Issue 2 (4-2020) ::
Int J Radiat Res 2020, 18(2): 201-207 Back to browse issues page
Mass attenuation coefficients of environmental samples for gamma-ray energies from 46.5 keV to 1408 keV
J.B. Lee, J.I. Byun Dr. , J.Y. Yun
Department of Nuclear and Radiation Safety, University of Science and Technology, 217, Gajeong-ro, 34113 Yuseong-gu, Daejeon, Korea , k975bji@kins.re.kr
Abstract:   (913 Views)
Background: In gamma-ray spectrometry for the radioactivity analysis of bulk samples, self-attenuation correction is necessary when the attenuation rates in test sample differ from the one in the efficiency calibration source. Thus, the mass attenuation coefficient of test samples is an important factor in gamma-ray spectrometry. This study estimates the mass attenuation coefficients for seven kinds of environmental samples. Materials and Methods: An uncollimated transmission system with a high purity germanium detector system was used to measure the gamma-ray transmission rates with and without test samples. The system was calibrated using C (activated charcoal), H2O, MnO2, NaCl, Na2CO3, and (NH4)2SO4 as reference materials. Sea sediment, surface soil, fish, seaweed, Chinese cabbage, milk, and pine needles were selected, and ten identical samples for each sample type were tested using the system. Results: The calibration of the uncollimated transmission system was validated with good agreement within 4% between linear attenuation coefficients by experiment and calculation for K2CrO4 and SiO2. The standard deviation of the mass attenuation coefficients for each kind of sample was estimated as less than 5% above around 100 keV. Conclusion: Mass attenuation coefficient does not significantly depend on the sample type for gamma-ray energy higher than around 100 keV, but mass attenuation coefficient for the lower gamma-ray energy should be considered even with similar kinds of sample. The mass attenuation coefficients tabulated in this paper can be used as a reference or comparable value in gamma-ray spectrometry for environmental samples.
Keywords: Mass attenuation coefficient, gamma-ray spectrometry, self-attenuation correction.
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Type of Study: Original Research | Subject: Medical Physics
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Lee J, Byun J, Yun J. Mass attenuation coefficients of environmental samples for gamma-ray energies from 46.5 keV to 1408 keV. Int J Radiat Res. 2020; 18 (2) :201-207
URL: http://ijrr.com/article-1-2871-en.html

Volume 18, Issue 2 (4-2020) Back to browse issues page
International Journal of Radiation Research
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