Radiological Hygiene
Analysis of neutron beam quality control test items in boron neutron capture therapy (BNCT) equipment
Cheng Jinsheng, Li Mingsheng, Shi Bin, Zhang Shufeng, Liu Yuntao, Song Mingzhe, Zhang Zizhu, Chen Jun
Published 2023-08-25
Cite as Chin J Radiol Med Prot, 2023, 43(8): 614-619. DOI: 10.3760/cma.j.cn112271-20221108-00438
Abstract
ObjectiveTo provide reference for establishing the testing method for quality control of neutron beam in boron neutron capture therapy (BNCT) equipment in China by testing the radiation characteristic parameters and dosimetry characteristic parameters of epithermal neutron beam in hospital neutron irradiator (IHNI).
MethodsBy comparing the uncertainties in the result of various test items with the deviation values recommended by the European Joint Research Center (EC-JRC), the feasibility of the relevant of testing method was analyzed and evaluated.
ResultsThe uncertainty in epithermal neutron fluence rate was 2.7%. The uncertainty in ratio of thermal to epithermal neutron fluence rate was 3.1%. The uncertainty in ratio of fast neutron air kerma to epithermal neutron fluence rate was 9.3%. The uncertainty in ratio of gamma air kerma to epithermal neutron fluence rate was 8.7%. The uncertainty in spatial distribution of neutron fluence rate was 2.7%. The uncertainty in thermal neutron fluence rate in phantom was 1.8%. The uncertainty in neutron and gamma-ray dose rate in phantom was 17.1% and 4.0%, respectively.
ConclusionsThe uncertainty in neutron dose rate measurement result in phantom is higher, and further research is needed to improve the accuracy of the testing method. The uncertainty in the measurement result of other test items is lower, and the accuracy of the test result is expected to meet the allowable deviation value recommended by the European Joint Research Center, and the test method is feasible.
Key words:
Boron neutron capture therapy; In-hospital neutron irradiator; Quality control test
Contributor Information
Cheng Jinsheng
Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
Li Mingsheng
Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China
Shi Bin
Department of Nuclear Technology and Application, China Institute of Atomic Energy, Beijing 102413, China
National Key Laboratory for Metrology and Calibration Techniques, China Institute of Atomic Energy, Beijing 102413, China
Zhang Shufeng
Department of Nuclear Technology and Application, China Institute of Atomic Energy, Beijing 102413, China
National Key Laboratory for Metrology and Calibration Techniques, China Institute of Atomic Energy, Beijing 102413, China
Liu Yuntao
Department of Nuclear Technology and Application, China Institute of Atomic Energy, Beijing 102413, China
Song Mingzhe
Department of Nuclear Technology and Application, China Institute of Atomic Energy, Beijing 102413, China
Zhang Zizhu
Beijing Capture Technology Co., Ltd, Beijing 102413, China
Chen Jun
Department of Nuclear Technology and Application, China Institute of Atomic Energy, Beijing 102413, China
National Key Laboratory for Metrology and Calibration Techniques, China Institute of Atomic Energy, Beijing 102413, China
