| Cheng Deqi,Yang Qin,Huang Xufan,et al.A Geant4-based research on radiation field distribution in a 9 MeV e-FLASH treatment room[J].Chinese Journal of Radiological Medicine and Protection,2025,45(11):1152-1156 |
| A Geant4-based research on radiation field distribution in a 9 MeV e-FLASH treatment room |
| Received:July 21, 2025 |
| DOI：10.3760/cma.j.cn112271-20250721-00259 |
| KeyWords:e-FLASH Radiation level Geant4 Radiation protection |
| FundProject: |
| Author Name | Affiliation | E-mail | | Cheng Deqi | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Yang Qin | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Huang Xufan | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Wu Peng | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Xie Haoran | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Xia Jing | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Wang Erfeng | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Yu Guofu | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Jiang Yu | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | | | Liu Xianhong | Zhongjiu Flash Medical Technology Co., Ltd., Mianyang 62100, China | xianhong.liu@changhong.com |
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| Abstract:: |
| Objective To investigate the radiation field distribution characteristics in a 9 MeV electron FLASH (e-FLASH) linear accelerator treatment room. Methods The Geant4 Monte Carlo program was employed for physical simulating of the radiation field distribution inside and outside the treatment room under a single-beam delivery condition with a total dose of 50 Gy at the reference point and a dose rate of 250 Gy/s. High-sensitivity radiation detectors (AT1123) were used to validate the measurements at key points. Results The dose rate at the reference point was approximately 9×1011 μSv/h. Due to the scattering and shielding effects, the deviation of the attenuation rate from the inverse-square law was observed and the isodose lines exhibited spatial drift. Measured dose rates at key points showed good agreement with the simulation result, with a maximum deviation within 30%. Conclusions The complex radiation field distribution can be effectively simulated using Geant4 in an e-FLASH treatment room. This indicated the Geant4 is not only applicable for the shielding calculations in e-FLASH radiotherapy facilities, but also for the design optimization through, reduction of trial-and-error iterations and engineering costs. |
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