| Li Mingsheng,Ma Xiangjie,Yuan Jilong,et al.Application of rapid Bragg peak detector and analysis of its measurement accuracy[J].Chinese Journal of Radiological Medicine and Protection,2026,46(6):599-604 |
| Application of rapid Bragg peak detector and analysis of its measurement accuracy |
| Received:July 21, 2025 |
| DOI：10.3760/cma.j.cn112271-20250721-00258 |
| KeyWords:Rapid Bragg peak detector|Proton range|Geant4|Bragg peak |
| FundProject: |
| Author Name | Affiliation | E-mail | | Li Mingsheng | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Ma Xiangjie | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Yuan Jilong | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Liu Hui | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | liuhui@nirp.chinacdc.cn |
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| Abstract:: |
| Objective To validate the feasibility of China's first proton heavy ion range quality control testing device (rapid Bragg peak detector) and the accuracy of the proton range measurement. Methods The rapid bragg peak detector was employed to measure proton beam range in both standard and fine modes. Based on the detector's operating principle, the Geant4 program was used to construct corresponding physical models. By simulating the positions of Bragg peaks and range data at different layer thicknesses, the accuracy of detector measurement result were analyzed. Results By employing the rapid bragg peak detector and reference to the operating principle of detector, the range measurements for protons at three energy levels were completed in both modes. Geant4 simulations covered 17 proton energy levels, with maximum range deviations of 0.48 mm at 1 mm layer thickness and 0.14 mm at 0.25 mm layer thickness. Conclusions The measurement accuracy of the rapid Bragg peak detector meets the requirement of "range deviation within ±1 mm" specified in relevant standards. It can be used for acceptance testing and routine quality control of proton and heavy ion accelerators. This device fills a technical gap in domestic quality control testing for proton and heavy-ion radiotherapy, meeting the application needs of relevant institutions for domestically produced equipment of the same kind. |
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