我国石油业广泛使用移动式工业探伤X线机来进行油(气)输运管道的探伤。移动式X线探伤人员所受剂量可比固定式X线探伤人员高16倍。在防护上国内多以时间防护和距离防护为主,在距离防护的施行中,应在探伤作业场所划分为“警戒区”和“监督区”的范围。因输油(气)管道焊口的探伤不固定,在距离防护时不可能每次探伤均测定出操作人员警戒线和非操作人员警戒线。操作人员在工作时一般按距焦点20m处操作(因电缆线长20m左右),我们就操作距离与剂量的关系进行了调查,现报告于下: China’s oil industry widely used mobile industrial testing X-ray machine for oil (gas) pipeline inspection. Mobile X-ray flaw detectors receive doses 16 times higher than those of fixed X-ray flaw detectors. In the protection of domestic and more time protection and distance protection mainly in the implementation of distance protection, should be in the test site is divided into “warning zone” and “surveillance zone” range. Because of oil (gas) pipe weld weld detection is not fixed, in the distance protection can not be detected each time the operator detection line and non-operator alert line. The operator at work generally according to the focal point 20m Department of operation (due to cable length 20m or so), we have to operate the relationship between distance and dose were investigated, the report is now under the following: