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Gamma-Ray Spectrometry to Find the Distribution of Diffused Radioactive Sources Underground
New Phys.: Sae Mulli 2019; 69: 701~706
Published online July 31, 2019;
© 2019 New Physics: Sae Mulli.

Byung Chae LEE1*, Sang Bum HONG2, Bum Kyung SEO2, Jun Ha KIM3, Yong Uhn KIM*4

1Department of Physics, Chungbuk National University, Cheongju 28644, Korea / Korea Atomic Energy Research Institute, Daejeon 34057, Korea
2Korea Atomic Energy Research Institute, Daejeon 34057, Korea
3Department of Nuclear Engineering, Kyunghee University, Yongin 17104, Korea
4Department of Physics, Chungbuk National University, Cheongju 28644, Korea
Correspondence to:
Received April 18, 2019; Revised May 7, 2019; Accepted May 19, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
In this research, the gamma spectrum measured in situ with a HPGe detector was analyzed, and the correlation equation to identify the depth distribution of $^{137}$Cs diffused contamination in the soil was derived. The correlation equation was derived using the values obtained from the spectra with depth distributions. The correlation results were verified by comparing them with the results obtained by using Monte Carlo N-Particle Transport (MCNP) simulations. The FTC (Full peak to Compton) method was applied to evaluate the depth distributions of the contamination. The derived correlations of the measured FTC results were found to have less than a 1\% relative error for various radioactivity depth distributions. The in-situ measurement-based rapid evaluation method of the radioactive depth contamination without core samples may be useful for site remediation and final status survey for site release after decommissioning.
PACS numbers: 23.90. +w
Keywords: $^{137}$Cs, Full peak to Compton method, Radioactivity depth distribution

July 2019, 69 (7)
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