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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 >Fast-neutron spectrometry using a 3He ionization chamber and digital pulse shape analysis
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Fast-neutron spectrometry using a 3He ionization chamber and digital pulse shape analysis

机译：使用3He电离室和数字脉冲形状分析的快速中子光谱法

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摘要

Digital pulse shape analysis (dPSA) has been used with a Cuttler-Shalev type 3He ionization chamber to measure the fast-neutron spectra of a deuterium-deuterium electronic neutron generator, a bare 252Cf spontaneous fission neutron source, and of the transmitted fast neutron spectra of a 252Cf source attenuated by water, graphite, liquid nitrogen, and magnesium. Rise-time dPSA has been employed using the common approach for analyzing n + 3He→ 1H+ 3H ionization events and improved to account for wall-effect and pile-up events, increasing the fidelity of these measurements. Simulations have been performed of the different experimental arrangements and compared with the measurements, demonstrating general agreement between the dPSA-processed fast-neutron spectra and predictions. The fast-neutron resonance features of the attenuation cross sections of the attenuating materials are clearly visible within the resolution limits of the electronics used for the measurements, and the potential applications of high-resolution fast-neutron spectrometry for nuclear nonproliferation and safeguards measurements are discussed.
机译：数字脉冲形状分析（dPSA）已与Cuttler-Shalev型3He电离室一起使用，用于测量氘-氘电子中子发生器，裸露的252Cf自发裂变中子源以及传输的快速中子光谱的快速中子光谱252Cf的源被水，石墨，液氮和镁衰减。上升时间dPSA已使用常见方法来分析n + 3He→1H + 3H电离事件，并进行了改进以解决壁效应和堆积事件，从而提高了这些测量的保真度。已经对不同的实验装置进行了模拟，并与测量结果进行了比较，证明了dPSA处理的快速中子光谱与预测之间的总体一致性。在用于测量的电子设备的分辨率极限内，可以清楚地看到衰减材料的衰减截面的快速中子共振特征，并讨论了高分辨率快速中子光谱在核不扩散和保障措施测量中的潜在应用。

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