Earticle

초록

영어

Background: At nuclear facilities and decommissioning sites, monitoring radioactivity concentrations in airborne particulates is crucial to prevent worker exposure. To avoid internal exposure, alpha-decay radionuclides must be detected. When monitoring alpha-decay radionuclides in airborne dust, we want to measure the concentration of only artificial radionuclides (e.g. , 238Pu, 239Pu, 240Pu, 235U, 238U, 241Am, and 244Cm). The radioactivity concentration must be measured separately for artificial (4.3–5.8 MeV) and natural radionuclides (212Bi, 214Po, and 212Po at 6.0, 7.7, and 8.8 MeV, respectively). Materials and Methods: We created response functions for various alpha-ray energies using a radiation simulation toolkit. Utilizing these response functions, we deconvolved the alpha-ray energy spectra measured while collecting dust on filter paper. To ensure the precision of the response function, we prepared a model including the distance between the filter and the detector and the structure of the light shield in detail. Results and Discussion: The deconvolved spectra had three clear peaks at 6.0, 7.7, and 8.8 MeV. These energies were consistent with those of 212Bi, 214Po, and 212Po. The deconvolved energy spectra showed that only a few measurements (4.0–5.8 MeV) were included in the energy range due to artificial radionuclides. From these measurements, the decision threshold for artificial radionuclides was determined to be about 1.5×10−7 Bq/cm3. Conclusion: Our findings demonstrated that we could measure artificial and natural radionuclides separately with the deconvolved alpha-ray energy spectra. Specifically, we were able to monitor artificial radionuclides down to low radioactivity concentrations in 10-minute measurements.

목차

ABSTRACT
Introduction
Materials and Methods
1. Setup for Alpha-Ray Spectroscopy
2. Preparation of the Response Matrix
3. Algorithm of the Deconvolution Process
Results and Discussion
1. Spectra with Checking Source
2. Performance of Deconvolved Spectra with Airborne Dust Sample
3. Decay of Natural Alpha-Ray Emitting Nuclides
4. Correlation Between Alpha- and Beta-Ray Activities
Conclusion
Conflict of Interest
Acknowledgements
Ethical Statement
Author Contribution
References

키워드

저자

• Makoto Sasano [ Mitsubishi Electric Corporation, Amagasaki, Japan ] Corresponding Author
• Masateru Hayashi [ Mitsubishi Electric Corporation, Amagasaki, Japan ]
• Yusuke Yanagawa [ Mitsubishi Electric Plant Engineering Corporation, Kobe, Japan ]
• Masatoshi Kai [ Mitsubishi Electric Plant Engineering Corporation, Kobe, Japan ]
• Yasushi Nakano [ Mitsubishi Electric Plant Engineering Corporation, Kobe, Japan ]
• Yoshitsugu Osawa [ Mitsubishi Electric Plant Engineering Corporation, Kobe, Japan ]
• Shunsuke Kurosawa [ Institute for Materials Research, Tohoku University, Sendai, Japan/Institute of Lase Engineering, Osaka University, Suita, Japan ]
• Yuki Morishita [ Japan Atomic Energy Agency, Tokaimura, 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