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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 >Performance tests of external moderators of a PGNAA setup.
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Performance tests of external moderators of a PGNAA setup.

机译：PGNAA设置的外部主持人的性能测试。

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Performance tests of external cylindrical moderators of an accelerator-based prompt gamma ray neutron activation analysis (PGNAA) setup have been carried out through thermal neutrons and prompt gamma-ray yield measurements. The PGNAA setup is to be used for analysis of cement samples. This study was conducted to investigate the effects of geometry of cylindrical moderator on yield of thermal neutrons and prompt gamma-rays for two different types of moderator assemblies. One of the moderators was to be used with a small sample and the other to be used with a large sample. Fast and thermal neutron yield was measured inside the sample volume as a function of the front moderator thickness as well as sample length. Neutron yield measurement was carried out at the King Fahd University of Petroleum and Minerals 350keV pulsed beam accelerator using nuclear track detectors. The pulsed 200keV deuteron beam with 5ns pulse width and 31.25kHz frequency was used to produce 2.8MeV neutrons via D(d,n) reaction. Neutron yield measurements showed that the large sample moderator has a smaller yield of thermal neutrons as compared to the small sample moderator, which is in complete agreement with the results of Monte Carlo yield calculations of the thermal and fast neutrons from both the moderators.Finally, the prompt gamma-ray yield from a Portland cement sample was measured using the two moderators and was compared with each other. As predicted by Monte Carlo simulations, in spite of a smaller yield of thermal neutrons, the large sample moderator has a higher yield of prompt gamma-rays.
机译：通过热中子和瞬态伽马射线产量测量，已经进行了基于加速器的瞬态伽马射线中子活化分析（PGNAA）装置的外部圆柱减速器的性能测试。 PGNAA设置将用于分析水泥样品。进行这项研究是为了研究圆柱形减速器的几何形状对两种不同类型的减速器组件的热中子产量和瞬发伽马射线的影响。主持人之一将用于小样本，另一名将用于大样本。测量了样品内部的快速中子产率和热中子产率，这是前减速器厚度以及样品长度的函数。中子产率的测量是在法赫德国王石油和矿产大学使用的核径迹探测器在350keV脉冲束加速器上进行的。脉冲宽度为5ns，频率为31.25kHz的200keV氘核脉冲束通过D（d，n）反应产生2.8MeV中子。中子产率的测量结果表明，与小样本缓和剂相比，大样本缓和剂的热中子产率较小，这与这两种缓和剂对热中子和快中子的蒙特卡洛产率计算结果完全吻合。使用这两种调节剂测量了波特兰水泥样品的即时伽马射线产量，并将其进行了比较。正如蒙特卡洛模拟所预测的那样，尽管热中子的产量较小，但大型样品减速剂的瞬发伽马射线产量较高。

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