Earticle

초록

영어

Background: Measuring the energy spectrum of γ rays to assess the exposure dose and identifying the leaked radioisotopes at the accident site and the surrounding environment is necessary in the case of an accident involving the leakage of radioactive material at a nuclear power plant or a radiation-related facility. High-purity germanium semiconductor detectors are utilized for γ-ray spectrometry due to their high energy resolution, but they exhibit a high initial and operational cost due to the need for a cooling mechanism. Materials and Methods: We improved the unfolding method for scintillators with a refined response function that involves the energy dependence of scintillation efficiency for secondary electrons produced by incident γ-ray interaction. Monte Carlo simulation code EGS5 with a mesh width of 5 keV in the energy range of 0–3 MeV was used to calculate response functions, assuming γ rays irradiated parallel to the detector sides. The unfolding algorithm involves an iterative approximation method, which is independent of initial guesses. Results and Discussion: The measurement accuracy of the γ-ray fluence rate was almost constant at <10% at ≥0.3 MeV caused by repeated measurements using 137Cs, 133Ba, 88Y, and 60Co radiation sources. Additionally, we confirmed linearity concerning the γ-ray intensity by changing the distance from the source to the detector. Conclusion: We verified that the unfolding method separated peaks for each γ-ray energy, although the difference in γ-ray energies was several tens of keV. Moreover, the accuracy of the unfolding method was almost constant and had linearity concerning γ-ray intensity.

목차

ABSTRACT
Introduction
Materials and Methods
1. Experimental Setup
2. Unfolding Method
3. Response Functions
Results and Discussion
Conclusion
Conflict of Interest
Acknowledgements
Ethical Statement
Author Contribution
References

키워드

저자

• Masateru Hayashi [ Advanced Technology R&D Center, Mitsubishi Electric Corporation, Amagasaki, Japan ] Corresponding Author
• Makoto Sasano [ Advanced Technology R&D Center, Mitsubishi Electric Corporation, Amagasaki, Japan ]
• Tetsushi Azuma [ Advanced Technology R&D Center, Mitsubishi Electric Corporation, Amagasaki, Japan ]
• Taisuke Makita [ Advanced Technology R&D Center, Mitsubishi Electric Corporation, Amagasaki, Japan ]
• Masakazu Nakanishi [ Energy Systems Center, Mitsubishi Electric Corporation, Kobe, Japan ]
• Hiroshi Nishizawa [ Department of Applied Nuclear Technology, Fukui University of Technology, Fukui, Japan ]

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