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目的探讨测井用密封型中子发生器的辐射安全管理方法。方法以某测井企业S/N8227型和S/N8299型氚靶活度为3.70×10~(11)Bq密封型中子发生器为例,通过估算工作人员在刻度和使用过程中的辐射影响,分析工作人员可能受到的年有效剂量。结果测井用密封型中子发生器刻度过程中,距离靶中心区400 cm处的剂量率为49.50μSv/h,工作人员受到的年最大有效剂量为0.50 mSv;测井作业完成1 h后,密封型中子发生器表面5 cm处的γ剂量率为10.00~12.00μSv/h,100 cm处的γ剂量率为0.20μSv/h。结论对测井用密封型中子发生器应采取优化管理方法,将密封型中子发生器作为氚靶源形式实行豁免管理;在销售、使用过程中按照Ⅱ类射线装置进行管理。
Objective To explore the radiation safety management method of sealed neutron generator used in logging. Methods Taking a well-calibrated neutron generator of 3.70 × 10 ~ (11) Bq with a tritium target of S / N8227 and S / N8299 in a well logging enterprise as an example, the effect of radiation on calibration and use of the staff was estimated Analyze the annual effective dose that staff may receive. Results During the calibration of the sealed neutron generator, the dose rate at the depth of 400 cm from the target center was 49.50μSv / h and the annual maximum effective dose was 0.50 mSv. After the logging operation was completed for 1 h, The γ dose rate at 5 cm of the surface of the sealed neutron generator is 10.00-12.00 μSv / h, and the γ dose rate at 100 cm is 0.20 μSv / h. Conclusion The sealed neutron generator should be optimized management method, and the sealed neutron generator should be exempted from management as a tritium target. In the process of sales and use, it should be managed according to the type Ⅱ radiation device.