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QUANTOM ? ? Optimization of the online neutron flux measurement system

机译：QUANTUM ？吗？在线中子通量测量系统的优化

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For the final disposal of radioactive waste, the waste packages have to meet the acceptance requirements defined by national licensing and supervisory authorities. Nondestructive methods are very much preferred over destructive methods for the qualification or re-qualification. Existing nondestructive methods as integral or segmented gamma scanning or neutron counting only determine the isotope specific activity but do not allow quantifying other non-radioactive hazardous substances. These should have been documented during creation, conditioning, and packaging of the waste. But especially for legacy waste, this documentation is often poor or even missing. This gap is to be filled by the QUANTOM~(?)measurement device that will determine the mass fraction of elements within a 200-l-drum using the Prompt- and Delayed- Gamma-Neutron-Activation-Analysis. In order to obtain a spatially resolved characterization, it will employ a segmented scanning approach. For the determination of the absolute mass fractions, the neutron flux inside the drum has to be known accurately. As the waste itself will alter the neutron distribution and flux, it is not possible to calculate the latter a priori from the gamma measurement. Hence the neutron flux has to be measured simultaneously with the gamma radiation. In this presentation, we will introduce the system for measuring the thermal neutron flux surrounding the waste drum from which the flux within the waste package has to be reconstructed. We performed a simulation study to score several possible detector placements for an improved reconstruction performance. We will show the outcome of these calculations and present the final design of the detector arrangement.
机译：为了最终处置放射性废物，废物包必须满足国家许可和监管部门规定的接受要求。对于鉴定或重新鉴定，非破坏性方法比破坏性方法非常受青睐。现有的非破坏性方法，例如积分或分段伽马扫描或中子计数，只能确定同位素的比活度，而不能量化其他非放射性有害物质。这些应该在废物的产生，处理和包装过程中进行记录。但是特别是对于遗留废物，此文档通常很差，甚至丢失。该间隙将由QUANTOM_（？）测量设备填补，该设备将使用提示和延迟伽马中子活化分析来确定200 l桶内元素的质量分数。为了获得空间分辨的特征，它将采用分段扫描方法。为了确定绝对质量分数，必须准确知道转鼓内部的中子通量。由于废物本身会改变中子的分布和通量，因此无法根据伽马测量值先验计算中子分布和通量。因此，必须与伽马辐射同时测量中子通量。在本演示中，我们将介绍用于测量废料桶周围热中子通量的系统，必须从中重建废料包中的通量。我们进行了一项仿真研究，对几个可能的探测器位置进行评分，以提高重建性能。我们将展示这些计算的结果，并介绍探测器布置的最终设计。

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