Radiation protection testing and radiation shielding performance evaluation for a novel self-shielding radiotherapy system
10.3760/cma.j.cn112271-20230831-00070
- VernacularTitle:新型自屏蔽放射治疗系统辐射屏蔽性能防护检测与评估
- Author:
Xiangjie MA
1
;
Mingsheng LI
;
Quanfu SUN
;
Chengcheng WANG
;
Xiao WEI
;
Jinsheng CHENG
Author Information
1. 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室，北京 100088
- Keywords:
Radiotherapy;
Self-shielding;
Radiation protection;
Dosimetry;
ZAP-X
- From:
Chinese Journal of Radiological Medicine and Protection
2023;43(11):906-912
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the radiation shielding performance for a novel self-shielded ZAP-X radiotherapy system used for intra-cranial and neck treatments. The present evaluation was performed according to the relevant Chinese national standards and the clinical placement of the radiotherapy system in an unshielded treatment room.Methods:The radiation source of the ZAP-X was a 3 MV linear accelerator. A total of 33 detection sites were selected surrounding the self-shielded system at 1.3, 2.3 and 3.3 m away from the periphery of the equipment. The maximum ambient dose equivalent rate in each irradiation condition was measured accordingly. A commonly used clinical treatment plan was selected to simulate the treatment process. During the delivery of this treatment plan, the cumulative doses of these 33 sites were measured, separately. The applicable current radiation protection standard for radiotherapy in China was chosen to evaluate the radiation shielding performance of the system.Results:According to the measurement result of the ambient dose equivalent rates along the aforementioned perimeter lines, a suggestion was put forward to redefine the existing 1 m controlled area by determining the distance at which the instantaneous dose rate of 10 μSv/h will not be exceeded. This is to meet the requirements of the Chinese standard GBZ 121-2020.Conclusions:According to the existing Chinese national radiation protection standards, the self-shielded radiotherapy system in the unshielded treatment room has the clinical applicability in China. But for such a novel self-shielded system, the corresponding performance testing and radiation protection standards shall be formulated.
