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目的分析某石化企业应用野外γ照相时的外照射辐射水平和放射防护状况,为辐射防护最优化和有效控制其职业危害提供建议。方法通过现场考察,了解典型的野外γ照相工作过程中,工作人员在辐射场中的分布和居留情况,并采用主动式和被动式方法测量辐射场剂量水平,综合分析其放射性职业危害水平。结果从个人剂量监测数据和现场调查数据说明,正常工作情况下,从事野外γ照相的工作人员一般接受的年剂量平均值为3.94msV/a。结论野外γ照相过程中的三个环节由于人员近距离接触放射源,外照射水平较高,应引起重视,并做好辐射防护最优化和相应的管理工作。
Objective To analyze the external radiation level and radiation protection status of a petrochemical enterprise in the application of field gamma photography and provide suggestions for optimizing the radiation protection and effectively controlling its occupational hazards. Methods Through the field investigation, we know the distribution and residence of workers in the radiation field during the typical field work of gamma photography, and use the active and passive methods to measure the dose level of the radiation field and comprehensively analyze the radioactive occupational hazards. Results Based on individual dose monitoring data and on-site survey data, the average annual dose accepted by workers in field gamma photography was 3.94 msV / a under normal working conditions. Conclusion Three steps in the process of field gamma photography should be paid more attention due to close contact with radioactive sources and higher level of external radiation. Radiation protection optimization and corresponding management should be done.