某医院伽马刀治疗中心放射源钴-60更换前后辐射环境监测

Radiation Environment Monitoring before and after Switching the Radiation Source Cobalt in the Gamma Knife Treatment Center of a Hospital

采用便携式X-γ剂量率仪对伽马刀治疗机表面及治疗室周围进行γ辐射空气吸收剂量率监测。通过对比换源前后监测数据的变化,估算治疗中心工作人员所受个人有效剂量是否在国家标准允许范围内。换源前后治疗机全年可能给工作人员带来的个人局部附加剂量满足《GB18871-2002电离辐射防护与辐射源安全基本标准》的要求,且换源前后治疗室周围开机、关机状态下测值无异常。

Portable X-γdosimeter was used to monitor the gamma radiation absorbed dose rate in the environment of the treatment room and the surface of the gamma knife machine.The changes of the monitoring data before and after switching the cobalt were compared to estimate if the effective dose exposed to the staff was under the permitted national standard range.The results showed that the possible additional dose exposed to personnel could meet the requirements of“Basic standards for protection against ionizing radiation and for the safety of radiation sources GB18871-2002”.Furthermore,no abnormal monitoring data were tested around the treatment room when turning on and off the machine before and after the change of cobalt.