Development of a compact flat response neutron detector

IEEE Nuclear Science Symposuim & Medical Imaging Conference Pub Date : 2010-10-01 DOI:10.1109/NSSMIC.2010.5873908

H. Harano, T. Matsumoto, J. Nishiyama, A. Masuda, A. Uritani, K. Kudo

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引用次数: 1

Abstract

Long counters are widely used as neutron fluence monitors by utilizing their flat-response feature. A bulky neutron moderator is required however to achieve the flat-response feature, which can be a disadvantage from the viewpoint of portability as well as an undesirable source of scattered neutrons. Just downsizing the moderator deteriorates the flat response especially for high-energy neutrons. We proposed a new method to downsize the moderator with keeping the flat-response feature and developed a compact flat-response neutron detector in the present study. The detector consists of two small spherical 3He proportional counters embedded in appropriate positions in a compact cylindrical polyethylene moderator. The sensitivity ratio between the two counters was adjusted to provide a flat response in the total outputs from the two counters. It was demonstrated by MCNPX calculations and response measurements for Cf and Am-Be neutrons and monoenergetic neutrons that the present detector had a good flat response in the wide energy range up to 20 MeV while being downsized by one fifth compared with long counters. The positions of the effective center were determined as a function of the neutron energy. We also proposed a method to evaluate the neutron energy using the detector, which will allow various new applications by taking advantage of measuring the neutron fluence and energy at the same time.

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紧凑型扁平响应中子探测器的研制

长计数器利用其平响应特性，被广泛用作中子通量监测仪。然而，为了实现平坦响应特性，需要一个体积庞大的中子慢化剂，从便携性的角度来看，这可能是一个缺点，也是一个不希望的散射中子源。缩小慢化剂的尺寸会使平坦响应恶化，尤其是高能中子。本文提出了一种减小慢化剂尺寸并保持其平响应特性的新方法，并研制了一种紧凑型平响应中子探测器。探测器由两个小的球形3He比例计数器组成，嵌入在紧凑的圆柱形聚乙烯慢化剂的适当位置。调整了两个计数器之间的灵敏度比，以便在两个计数器的总输出中提供平坦的响应。对Cf、Am-Be中子和单能中子的MCNPX计算和响应测量表明，该探测器在20 MeV以下的宽能量范围内具有良好的平坦响应，而与长计数器相比，其体积缩小了五分之一。有效中心的位置被确定为中子能量的函数。我们还提出了一种利用探测器来评估中子能量的方法，该方法将利用同时测量中子通量和能量的优势，允许各种新的应用。

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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IEEE Nuclear Science Symposuim & Medical Imaging Conference

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