Earticle

초록

영어

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 (β) 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 137Cs 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.

목차

ABSTRACT
 1. INTRODUCTION
 2. MATERIALS AND METHODS
  2.1 Evaluation method of depth distribution
  2.2 In situ calibration correction
 3. RESULTS AND DISCUSSION
  3.1 Laboratory measurement and simulation results
  3.2 Field measurement results
 4. CONCLUSION
 ACKNOWLEDGEMENTS
 REFERENCES

키워드

저자

• Sang Bum Hong [ Korea Atomic Energy Research Institute, Daejeon, Republic of Korea ] Corresponding author
• Jong Soo Nam [ Korea Atomic Energy Research Institute, Daejeon, Republic of Korea ]
• Yong Suk Choi [ Korea Atomic Energy Research Institute, Daejeon, Republic of Korea ]
• Bum Kyoung Seo [ Korea Atomic Energy Research Institute, Daejeon, Republic of Korea ]
• Jei Kwon Moon [ Korea Atomic Energy Research Institute, Daejeon, Republic of Korea ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629