血液辐照仪的辐射剂量监测
Monitoring Results of Radiation Dose in a Blood Irradiator
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摘要:
目的 通过对血液辐照仪周围环境和操作人员个人年有效剂量的监测,为日后的监管工作提供科学依据。 方法 于2004-2011 年,采用451P 型γ射线环境巡测仪每年对环境监测,采用徽章式热释光剂量计每季度对操作人员的个人剂量监测。 结果 环境监测结果显示,开机状态,辐照仪北侧0.05 m处平均剂量率最大,为0.78 μSv/h,0.05 m四周平均剂量率为0.73 μSv/h,1 m处平均剂量率为0.38 μSv/h;关机状态,0.05 m四周平均剂量率0.21 μSv/h,1 m处平均剂量率为0.13 μSv/h。操作人员人均年有效剂量平均值最高为0.186 mSv/a,最低为0.171 mSv/a,平均为0.181 mSv/a。 结论 血液辐照仪安全性较好,但日常工作中应注重其环境和操作人员个人辐射剂量的监测。 Abstract:Objective To monitor the radiometric data of a selected blood irradiator to the surrounding environment and the accumulated radiation dose received by operators, and to provide scientific basis for blood irradiator supervision in the future. Methods From 2004 to 2011, environmental radiometric data of 451P γ-ray were acquired at different distances from a selected blood irradiator by γ-ray radiometric monitor. Personal accumulated radiation doses of machine operators were recorded by thermoluminescent dosimeters quarterly. Results During operation, the maximum γ-ray dose-rate (0.78 μSv/h) was found at 0.05 m north from the blood irradiator, and the averages were 0.73 μSv/h at 0.05 m radius and 0.38 μSv/h at 1m radius. When the blood irradiator was switched off, the average dose rates at 0.05 m radius and 1m radius were 0.21 μSv/h and 0.13 μSv/h, respectively. For the operators, the annually accumulated doses ranged from 0.171 mSv/a to 0.186 mSv/a, and the average was 0.181 mSV/a. Conclusion The blood irradiator is within the safe range of national occupational exposure standard and its environmental and personal radiation doses should be monitored regularly by operators.
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