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目的对无损检测用驻波电子直线加速器防护性能进行检测与分析,可以确保加速器设备的出厂质量,并为现场作业人员的规范操作和有效防护提供指导。方法以13台加速器为检测研究对象,使用PTW UNIDOS型剂量仪、LiF(Mg,Cu,P)热释光剂量计(TLD)等仪器,测量了加速器的主要剂量学指标,并结合相关标准进行分析和评价。结果 13台加速器的电子束能量与所标定的能量相符,与辐射输出相关的剂量学指标合格率均为100%,加速器组装体距靶1 m处312个测量位点中,99.0%位点的相对辐射泄漏率低于1.0‰,每台加速器距靶点1 m的球面上24个点的平均相对辐射泄漏率均低于0.7‰,符合产品出厂的企业标准。结论无损检测加速器的防护性能是与设备常规运行质量和现场人员的个人防护直接相关的,应加强每台设备投入工业运营前的防护检测。
Objective To detect and analyze the protective performance of standing wave electron linac in nondestructive testing, which can ensure the factory quality of accelerator equipment and provide guidance for the standard operation and effective protection of field workers. Methods Thirteen accelerators were used as test objects. The main dosimetric indexes of the accelerator were measured by PTW UNIDOS dosimeter and LiF (Mg, Cu, P) thermoluminescence dosimeter (TLD) Analysis and evaluation. Results The energies of the electron beams of the 13 accelerators were in accordance with the calibrated energies and the pass rates of the dosimeters related to the radiation output were both 100%. In the accelerator assembly, 99.0% of the 312 measurement sites at 1 m from the target The relative radiation leakage rate is lower than 1.0 ‰. The average relative radiation leakage rate of 24 points on a spherical surface with a distance of 1 m from each target of the accelerator is less than 0.7 ‰, which is in line with the enterprise standard of the product. Conclusion The performance of non-destructive testing accelerators is directly related to the normal running quality of equipment and the personal protection of on-site personnel. Protection testing of each equipment before industrial operation should be strengthened.