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华北油建二公司，1991年开始在呼和浩特炼油厂从事γ探伤。探伤机为能源部电力建设研究院生产SD-I型，放射源为Ir-192活度3．6TBq（1991－08-17）。被探伤物为400m3，厚度3．5～4．5cm的贮氮球罐。探伤时间在晚间20点至次日6点。12月3日早晨在探伤结束收源过程中发生了一起由输
North China Oil built two companies, started in 1991 in Hohhot refinery γ detection. The flaw detector is SD-I type produced by the Electric Power Construction Research Institute of the Ministry of Energy and the activity is 3.6TBq (Irradiation of Ir-192) source (1991-08-17). Discovered was 400m3, the thickness of 3.5 ~ 4.5cm nitrogen storage tank. Detection time at 20:00 to 6:00 the next day. On the morning of December 3, a total loss occurred in the process of collecting the source of the flaw detection