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由于导爆索材料和结构安排的特殊性,使用X射线检测其内部药柱的缺陷和疏密变化存在许多困难,而中子照相技术却能很好地解决这一问题。项目组在分析掌握现有的中子照相技术进展的基础上,完成了基于热中子照相的导爆索无损检测系统实验样机的设计以及成像装置的制作。基于热中子照相的导爆索无损检测系统主要由3部分构成,分别是可移动的小型中子发生器、慢化及屏蔽体、成像装置。同时,利用中国原子能科学研究院的492反应堆提供的热中子束作为中子源,开展了成像系统对聚乙烯样品以及部分导爆索等样品的检测能力评估实验,根据检测结果建立了基于CCD相机的
Due to the particularity of detonating cord material and structural arrangement, there are many difficulties in using X-ray to detect the defects and densities of the inner drug column. However, neutron radiography can solve this problem well. Based on the analysis and grasping of the progress of the existing neutron imaging technology, the project team completed the design of the experimental prototype of the NDT system based on thermal neutron photography and the fabrication of the imaging device. The detonating cord non-destructive testing system based on thermal neutron photography is mainly composed of three parts, namely a movable small neutron generator, a moderator, a shielding body and an imaging device. At the same time, using the thermal neutron beam provided by 492 reactor of China Institute of Atomic Energy as the neutron source, the imaging system was used to evaluate the detection ability of polyethylene samples and some detonating cables. Based on the detection results, Camera