Neutron dieaway methods for criticality safety measurements of fissile waste
Neutron dieaway methods for criticality safety measurements of fissile waste
复制标题
用于裂变废物临界安全测量的中子衰减方法
DOI：
--
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
K. Coop
中科院分区：
文献类型：
--
作者：
K. Coop
介绍了利用脉冲中子源对裂变材料容器进行热中子探测的微分扩散技术（DDT）。这一方法广泛用于验证超铀核废物，以便最终安置在废物隔离试验厂。为了临界安全的目的，在一个55加仑的废料桶中允许的易裂变材料的上限为200克。涉及废物基质效应和自屏蔽的问题可能会严重限制滴滴涕测量的准确性。正在开发一种使用热和超热中子询问的dieaway方法，该方法具有减少这些问题的潜力。最近的实验和计算结果，这种发展的描述。参考文献14篇，图7，1个选项卡。
The differential dieaway technique (DDT), which uses a pulsed neutron source to interrogate containers of fissile materials with thermal neutrons, is reviewed. This method is widely used for certifying transuranic nuclear wastes for eventual emplacement at the Waste Isolation Pilot Plant. For purposes of criticality safety, an upper limit of 200 g of fissile material is permitted in a 55-gal waste drum. Problems involving waste-matrix effects and self-shielding may severely limit the accuracy of the DDT measurement. A dieaway method that uses both thermal and epithermal neutron interrogation, which has the potential for reducing these problems, is being developed. Recent experimental and calculational results for this development are described. 14 refs., 7 figs., 1 tab.