Moderator-free neutron detection

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI:10.1109/NSSMIC.1998.775161

R. Hansen, A. J. Peurrung, P. Reeder, D.C. Stromswold

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Abstract

Recent investigations have indicated that moderator-free thermal neutron detection may hold advantages for applications such as long-range neutron source detection and remote-handled TRU waste characterization. Moderator-free neutron detection involves the use of a directionally shielded thermal neutron detector to record only those thermal neutrons incident from a particular direction. Minimization of the amount of moderating material at the location of the detector avoids the detection of fast neutrons, which constitute a substantial fraction of background neutrons. Experimental results reported in this paper were generated using a square meter instrument constructed at Pacific Northwest National Laboratory (PNNL). Such an approach to neutron detection should allow the reasonably rapid detection of modest neutron sources from distances greater than 50 meters and the partial characterization of waste with contact dose rates as high as 10,000 R/hr.

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无慢化剂中子探测

最近的研究表明，无慢化剂热中子探测可能在远程中子源探测和远程处理TRU废物表征等应用中具有优势。无慢化剂中子探测包括使用定向屏蔽热中子探测器，只记录从特定方向入射的热中子。在探测器的位置上，将慢化材料的量最小化，避免了快中子的检测，而快中子构成了背景中子的很大一部分。本文的实验结果是在太平洋西北国家实验室(PNNL)建造的一个平方米的仪器上产生的。这种中子探测方法应允许在距离大于50米的地方合理快速地探测中等中子源，并对接触剂量率高达10,000 R/hr的废物进行部分表征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)

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