Earticle

초록

영어

Background: Activation of air and water in the electron linear accelerator for medical use has not been considered severely. By the new Japanese regulation for protection of radiation hazard, it became indispensable to evaluate of activation of air and water in the accelerator room. The measurement of induced activity in air and water components in the electron energy region of 10 to 20 MeV is very difficult, because this energy region is close to the threshold energy region of photonuclear reactions. Then, we measured the photonuclear reaction yields of 13N, 15O, and 11C by using the electron linear accelerator. Obtained data were compared with the data calculated by the Monte Carlo method. Materials and Methods: An activation experiment was performed at the Research Center for Electron Photon Science, Tohoku University. Highly purified SiO2, Si3N4, and carbon disks were irradiated for 10 minutes by bremsstrahlung converted by a tungsten plate. Induced activity from C, N, and O was obtained. Monte Carlo calculation was performed using MCNP5 and AERY (DCHAIN-SP) to simulate the experimental condition. Cross section data were adopted the KAERI dataset. Results and Discussion: In our experiment in hospital, calculated values were not agreed with experimental values. It might be three possible reasons as the cause of this deference, such as irradiation energy, calculation procedure and cross section data. Obtained data of this work, calculated and experimental values were good agreement with each other within one order. In this work, we used KAERI dataset of photonuclear reaction instead of JENDL. Therefore, it was found that the photonuclear cross section data of light elements are most important for yield calculation in these reactions. Conclusion: Further improvement for calculation using a new dataset JENDL/PD-2015 and considering electron energy spreading will be needed.

목차

ABSTRACT
 Introduction
 Materials and Methods
  1. Materials
  2. Irradiation
  3. Measurement of radioactivity
  4. Monte Carlo calculation
 Results and Discussion
  1. Induced activity
  2. Yield of pertinent nuclear reaction
  3. Activity in air components
 Conclusion
 Acknowledgements
 References

키워드

저자

• Kazuyoshi Masumoto [ High Energy Accelerator Research Organization, Tsukuba ] Corresponding author
• Hiroshi Matsumura [ High Energy Accelerator Research Organization, Tsukuba ]
• Kazuaki Kosako [ Shimizu Corporation, Tokyo, Japan ]
• Kotaro Bessho [ High Energy Accelerator Research Organization, Tsukuba ]
• Akihiro Toyoda [ High Energy Accelerator Research Organization, Tsukuba ]

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