A Geant4-based research on radiation field distribution in a 9 MeV e-FLASH treatment room
- VernacularTitle:基于Geant4的9 MeV电子线FLASH治疗室的辐射场分布研究
- Author:
Deqi CHENG
1
;
Qin YANG
1
;
Xufan HUANG
1
;
Peng WU
1
;
Haoran XIE
1
;
Jing XIA
1
;
Erfeng WANG
1
;
Guofu YU
1
;
Yu JIANG
1
;
Xianhong LIU
1
Author Information
- Publication Type:Journal Article
- Keywords: e-FLASH; Radiation level; Geant4; Radiation protection
- From: Chinese Journal of Radiological Medicine and Protection 2025;45(11):1152-1156
- CountryChina
- Language:Chinese
- 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 9×10 11 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.
