Earticle

초록

영어

Background: This study aimed to investigate the activation characteristics of concrete in synchrotron- type proton therapy facilities for future decommissioning. The larger synchrotrontype proton therapy facilities have a greater potential impact on decontamination than the cyclotron proton therapy facilities investigated in our previous study. Specific activity levels in the concrete after 30 years of operation in synchrotron-type proton therapy facilities were predicted from the measured thermal neutron fluence rates on the concrete during the operation to compare them with the clearance level. Materials and Methods: The investigations were conducted in the synchrotron-type proton therapy facilities at Medipolis Proton Therapy Research Center and Proton Medical Research Center, University of Tsukuba Hospital. The thermal neutron fluence rates on the concrete during the operation were measured by three different methods: using 24Na radioactivity produced in concrete, thermoluminescence dosimeters, and Au foils. Results and Discussion: The specific activity levels in the concrete throughout the synchrotron proton therapy facilities were negligible compared with the clearance level. The specific activity level of concrete in the accelerator room in synchrotron-type proton therapy facilities where an accelerator controls the proton energy was much lower than that in cyclotron-type proton therapy facilities where a degrader controls the proton energy. Conclusion: Concrete does not need to be treated as radioactive waste when decommissioning synchrotron-type proton therapy facilities.

목차

ABSTRACT
Introduction
Materials and Methods
1. Investigated Facilities
2. Survey for Residual Radioactivity in the Beamlines
3. Measurements of Thermal Neutron Fluence Rates bythe in situ 24Na Measurement Method
4. Measurements of Thermal Neutron Fluence Rates Using Thermoluminescence Dosimeters and Au Foils
Results and Discussion
1. MPTRC
2. PMRC
3. Comparison with Cyclotron-Type Proton Therapy Facilities
Conclusion
Conflict of Interest
Acknowledgements
Ethical Statement
Author Contribution
References

키워드

저자

• Hiroshi Matsumura [ Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan ] Corresponding Author
• Go Yoshida [ Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan ]
• Akihiro Toyoda [ Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan ]
• Kazuyoshi Masumoto [ Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan ]
• Hajime Nakamura [ Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan ]
• Taichi Miura [ Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan ]
• Takeji Sakae [ Proton Medical Research Center, University of Tsukuba, Tsukuba, Japan ]
• Naoaki Kondo [ Medipolis Proton Therapy and Research Center, Medipolis Medical Research Institute, Ibusuki, 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