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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Simulation of a collimator and sapphire filter for PGAA facility of the Moroccan TRIGA MARK II research reactor
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Simulation of a collimator and sapphire filter for PGAA facility of the Moroccan TRIGA MARK II research reactor

机译：摩洛哥赛马赛马克II研究反应堆PGAA设施的准直器和蓝宝石过滤器的仿真

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摘要

The Prompt Gamma Neutron Activation Analysis (PGAA) facility will be commissioned at the NB1 beam tube of the Moroccan TRIGA MARK II research reactor. PGAA is a non-destructive analytical technique used for multi-elemental analysis and especially for light element analysis. For better performances, PGAA requires small and focused beam, and high Phi(th)/Phi(ep) and Phi(th)/Phi(fast) ratios, and low background gamma radiation. For this purpose, fast neutron filters are commonly used to reduce fast and epithermal components of neutron flux. In this paper, the impact of sapphire filter, introduced, within the collimator hole, at the beam port on neutron spectra was evaluated. Monte Carlo, MCNP6.2, code has been used with ENDF VII.1 neutron cross section library to perform this study. An approximate TRIGA MARK II reactor MCNP model has been used to generate neutron spectra at the entrance of the collimator. Then an independent model for both collimator and sapphire filter has been brought into calculation to fulfil our purpose. Results showed an increase of about 8 times for both Phi(th)/Phi(ep), and Phi(th)/Phi(fast) ratios using a 10 cm length of sapphire.
机译：提示伽马中子激活分析（PGAA）设施将在摩洛哥Triga Mark II研究反应堆的NB1梁管处调试。 PGAA是一种用于多元素分析的非破坏性分析技术，特别是对于轻质元素分析。为了更好的性能，PGAA需要小和聚焦光束，以及高pHI（TH）/ phi（EP）和PHI（TH）/ phi（快）比，以及低背景伽马辐射。为此目的，通常用于减少中子通量的快速和骨头成分的快节奏。本文评价了在中子谱上的光束端口处引入的蓝宝石过滤器在中子谱上的影响。 Monte Carlo，MCNP6.2，代码已被用于ENDF VII.1中子横截面库进行本研究。近似Triga Mark II反应器MCNP模型用于在准直器的入口处产生中子谱。然后已经进入了两种准直器和蓝宝石过滤器的独立模型，以实现我们的目的。结果表明，使用10厘米长度的蓝宝石，PHI（TH）/ PHI（EP）和PHI（TH）/ phi（快速）比率增加了约8倍。

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