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目的检测与评价某医院γ射线头部立体定向外科治疗(γ-刀)的放射卫生防护情况,保证其剂量学参数和防护安全性能符合有关标准和要求。方法依据X、γ射线头部立体定向外科治疗放射卫生防护标准(GBZ168—2005)对γ-刀进行检测与评价。结果γ-刀剂量学参数:焦点剂量率为2.39Gy/min,焦点计划剂量与实测剂量的相对偏差为2.3%,机械中心与照射野中心的距离为0.19～0.41mm,照射野尺寸与标称值偏差为0.11～1.12mm,照射野半影宽度为2.86～4.12mm;防护安全性能:治疗室周围辐射水平为0.06～0.20μGy/h,安全连锁及通风装置工作正常。结论γ-刀剂量学参数和防护安全性能符合有关标准要求。
Objective To detect and evaluate the radiation health protection of γ-ray head stereotactic surgical treatment (γ-knife) in a hospital to ensure that its dosimetric parameters and safety protection meet the relevant standards and requirements. Methods According to X-ray and γ-ray stereotactic surgical treatment of radiation health protection standards (GBZ168-2005) γ-knife detection and evaluation. Results γ-knife dosimetry parameters: the focal dose rate of 2.39Gy / min, the focus of the planned dose and the measured dose relative deviation of 2.3%, the distance between the mechanical center and the center of the irradiation field 0.19 ~ 0.41mm, the size and nominal field The value deviation is 0.11 ~ 1.12mm, the width of the irradiation penumbra is 2.86 ~ 4.12mm; Protective safety performance: the radiation level around the treatment room is 0.06 ~ 0.20μGy / h, and the safety chain and ventilator work normally. Conclusion γ-knife dosimetry parameters and safety performance meet the requirements of the relevant standards.