γ-刀漏射线分布及环境背景辐射的探测

Environmental radiation exposure surveys of the leksell gamma unit

本文来用热释光剂量计及剂量仪,测量出γ-刀立体定向放射治疗中,在开机与关机两种情况下,治疗室内漏射线的分布及周围环境的背景辐射,并试图揭示漏射线产生的原因。结果:开机时,治疗室内存在一个扇形区域,在此区域内的辐射率高于区域外的辐射率,其最高值可达到130000微戈瑞每小时;周围环境的辐射率约为0.18～0.63微戈瑞每小时,符合我国现行的《放射防护条例》的规定。

The source of the Gamma Unit is Co-60, with a total activity of 6040 Ci.Although the Gamma Unit is shielded, background radiation and radiation leakage are unavoidable.Therefore,it is essential to measure the exposure rates in both the treatment room and the surrounding areas.the exposure levels in the treatment room during operation of the Gamma Unit ranged from 10-130000uGy/h,and in the surrounding areas they ranged from 0.18-0.63uGy/h.None of the area outside the treatment room exceeded the Aicmic Energy Council (AEC) of the people's Republic of China regulation.All measured exposure levels were well below the Limits established by the AEC Committee.