薄壁小型球形储罐Se75双源γ射线全景曝光检测的研究

摘要：我国已经将Se75γ射线探伤技术引进到了设备安装质量检测当中，一般的薄壁小型球形储罐质量检测要进行100%RT的探伤。目前的X射线探伤技术，不但需要的探伤时间长，效率低，而且工作量非常大。Ir192进行全景曝光，其底片的灵敏度不够高，而Se75灵敏度高于Ir192，并且Se75的适用厚度范围正好弥补Ir192。所以对Se75γ射线探伤技术在薄壁小型球形储罐质量检测方面的研究具有非常重要的价值。本文结合中海壳牌南海石化惠州乙烯环氧乙烷/乙二醇项目的两个360m3球形储罐Se75双源γ射线全景曝光检测经验，针对薄壁小型球形储罐射线检测的特点，进行了试验对比及其研究，分析总结了应考虑的技术问题。以便以后具有借鉴之意义。

关键词：薄壁小型球形储罐；Se75；全景曝光；检测

Abstract: China has Se75 gamma rays detection technology import to equipment installation quality testing of the thin small spherical tank general quality testing to be 100% RT detection. The X-ray detection technology, not only need testing time is long, low efficiency, and the workload is very big. To view Ir192 exposure, the sensitivity of the film is not good enough and the Se75 sensitivity is higher than Ir192, and the applicable scope Se75 just make up for Ir192 thickness. So for Se75 gamma rays testing technique in the thin wall small spherical tanks in the inspection of the quality of the research has important value. Combining with the CSPC epoxy ethane/ethylene glycol huizhou ethylene project two 360 m3 spherical tanks Se75 dual-source gamma rays panoramic exposure test experience, according to small spherical tanks thin-walled X-ray testing of the characteristics of experimental comparison and research, this paper analyzes the technical problems should be considered. With the meaning of the reference for later.

Keywords: thin small spherical tanks; Se75; Panorama exposure; detection

引言

本世纪Se75γ射线探伤已经被引进到了我国,首先已被我国电建施工单位进行适用性分析、研究及其试用,已取得了非常不错的效果。Se75γ射线探伤技术在国外研究应用起步比较早,所以我国现在正处于研究及其推广的阶段。国家电力还专门在2000年5月组织了一大批的无损检测专家对Se75γ射线探伤试验结果进行深入的讨论、分析及其评价。专家们一致认为：Se75γ探伤在锅炉压力容器、薄壁小型球形储罐等行业射线检测中, 应用前景非常广阔。随后电力行业的