Earticle

초록

영어

Background: A portable gamma irradiation system was developed for on-site calibration of environmental radiation monitoring devices. This system uses a portable collimator and gammaray sources such as 57Co, 133Ba, 137Cs, and 60Co, each with a nominal radioactivity of 10 MBq or less. Materials and Methods: The air kerma rate produced by the system was measured using a spherical ionization chamber with a 10 L sensitive volume. This chamber was calibrated against the air kerma rate measured with primary standard ionization chambers. The system’s performance was evaluated by comparing the calibration results of the monitoring device with those obtained using a conventional method involving a standard ionization chamber for outdoor use. Results and Discussion: The calibration coefficient of the spherical ionization chamber was within ±2% of the value of 3.029×103 Gy/C for photon energies ranging from 50 keV to 1,250 keV. The air kerma rate of the irradiation field produced by the portable system ranged from 0.17 μGy/hr to 4.7 μGy/hr, with an uncertainty between 2.4% and 10%. The calibration coefficients obtained using the portable system were consistent with those from the conventional method. Conclusion: The portable gamma irradiation system offers significant advantages, including preventing damage to standard ionization chambers used outdoors and reducing measurement time compared to conventional methods. Due to its ease of construction and implementation, the system is expected to be useful not only for on-site calibration of monitoring devices but also in various radiation safety management scenarios.

목차

ABSTRACT
Introduction
Materials and Methods
1. Portable Gamma Irradiation System
2. Calibration of the Spherical Ionization Chamber
3. Calibration of the Irradiation Fields Produced with the Portable Gamma Irradiation System
4. On-site Calibration of the Monitoring Post
Results and Discussion
1. Calibration Coefficient of the Spherical Ionization Chamber
2. Air Kerma Rate of the Gamma-Ray Field from the Irradiation System
3. Calibration Coefficient of the Monitoring Post
Conclusion
Conflict of Interest
Acknowledgements
Ethical Statement
Author Contribution
References

키워드

저자

• Masahiro Kato [ National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan ] Corresponding Author
• Junya Ishii [ National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan ]
• Hiroyuki Tanaka [ Japan Chemical Analysis Center, Chiba, Japan ]
• Midori Sugiyama [ Japan Chemical Analysis Center, Chiba, Japan ]
• Tadahiro Kurosawa [ National Institute of Advanced Industrial Science and Technology, Tsukuba, 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