口岸监管环节NORM中弱源夹带问题试验研究

Experimental Study on Weak Source Entrainment in Norm at Port

为探究口岸监管环节NORM中弱源夹带风险,采用分组试验方法,对通道式辐射探测设备报警曲线形状特点、报警峰强度、报警曲线长度等报警特征进行分析。结果表明在均匀装载的NORM中,弱源对报警计数率影响较小。由于NORM的存在,放置于集装箱不同位置弱源不会出现对应位置的报警峰,而是被均匀装载的NORM报警峰淹没,只是在中心位置出现强度稍高的NORM报警峰。存在夹带情况时,辐射曲线的报警区域面积有所增加,但单纯从报警曲线上,仍无法有效识别出NORM中夹带的弱源。

In order to explore the risk of weak source entrainment in cargoes which contain NORM nuclides at port,the characteristics of RPM’s alarm curve were analyzed by using grouping test method. The result showed that the influence of weak source on the overall radiation count rate of goods was not obvious. it would not appear the corresponding peak on alarm curve.The area of alarm curve is increased,but the weak source in norm can not be identified only from the alarm curve.