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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Background: In situ gamma spectrometry has been used to measure environmental radiation, assumptions are usually made about the depth distribution of the radionuclides of interest in the soil. The main limitation of in situ gamma spectrometry lies in determining the depth distribution of radionuclides. The objective of this study is to develop a method for subsurface characterization by in situ measurement. Materials and Methods: The peak to valley method based on the ratio of counting rate between the photoelectric peak and Compton region was applied to identify the depth distribution. The peak to valley method could be applied to establish the relation between the spectrally derived coefficients (Q) with relaxation mass per unit area (${\beta}$) for various depth distribution in soil. The in situ measurement results were verified by MCNP simulation and calculated correlation equation. In order to compare the depth distributions and contamination levels in decommissioning KRR site, in situ measurement and sampling results were compared. Results and Discussion: The in situ measurement results and MCNP simulation results show a good correlation for laboratory measurement. The simulation relationship between Q and source burial for the source layers have exponential relationship for a variety depth distributions. We applied the peak to valley method to contaminated decommissioning KRR site to determine a depth distribution and initial activity without sampling. The observed results has a good correlation, relative error between in situ measurement with sampling result is around 7% for depth distribution and 4% for initial activity. Conclusion: In this study, the vertical activity distribution and initial activity of $^{137}Cs$ could be identifying directly through in situ measurement. Therefore, the peak to valley method demonstrated good potential for assessment of the residual radioactivity for site remediation in decommissioning and contaminated site.
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참고문헌 (6)
참고문헌 신청
Lee KW / 2010 / Final status of the decommissioning of research reactor in Korea / J. Nucl. Sci. Technol 47(12):1227~1232
Benke RR / 2001 / An improved in situ method for determining depth distribution of gamma-ray emitting radionuclides / Nucl. Instrum. Method Phys. Res. A 463:393~421
Zoombori P / 1992 / In situ measurement of the contaminated in some selected settlements of Byelorussia(BSSR), Ukraine (UkrSSR) and the Russian Federation(RSFSR) / J. of Enviro. Radioact 17:97~106
Tyler AN / 1999 / Monitoring anthropogenic radioactivity in salt marsh environments through in situ gamma ray spectrometry / J. Enviro. Radioact 45:235~252
Norihiro M / 2014 / Depth profiles of radioactive cesium in soil using scraper plate over a wide area surrounding the Fukushima Dai-ichi Nuclear Power Plant / Japan. J. Enviro. Radioact 139:427~434
Benke RR / 2001 / An improved in situ method for determining depth distribution of gamma-ray emitting radionuclides / Nucl. Instrum. Method Phys. Res. A 463:393~421
Zoombori P / 1992 / In situ measurement of the contaminated in some selected settlements of Byelorussia(BSSR), Ukraine (UkrSSR) and the Russian Federation(RSFSR) / J. of Enviro. Radioact 17:97~106
Tyler AN / 1999 / Monitoring anthropogenic radioactivity in salt marsh environments through in situ gamma ray spectrometry / J. Enviro. Radioact 45:235~252
Norihiro M / 2014 / Depth profiles of radioactive cesium in soil using scraper plate over a wide area surrounding the Fukushima Dai-ichi Nuclear Power Plant / Japan. J. Enviro. Radioact 139:427~434
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