Imaging of low Z masked with high Z (Pb, U) materials using 14 MeV neutron

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-05-01 DOI:10.1088/1748-0221/19/05/p05022

S. Bishnoi, T. Patel, P.S. Sarkar, L. Pant

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Abstract

An experimental study has been performed using 14 MeV neutrons for imaging of low Z material (particularly composed of C, H, O elements) masked with thick layers of dense and high Z materials. The experimental setup consists of a D-T neutron generator, a metallic collimator and an imaging system. The imaging system is designed with a polypropylene zinc sulphide scintillator screen integrated with a lens coupled 16-bit ICCD camera. Imaging capability of the system was investigated using iron test samples with holes and line pair features. The minimum hole size of 2 mm could be imaged at a contrast of 36% and a line of 2 mm width visible at a contrast of 24% indicating the system's resolution of ∼ mm. Low Z samples such as water (H2O) and polyethylene (C2H2) n placed behind thick layers of Pb (40 mm) and Uranium (35 mm), were imaged successfully. These images reveal the system's ability towards low Z material imaging in the presence of heavier metals. Good contrast images acquired at a lower neutron yield of ∼ 5 × 108 n/sec of D-T neutron generator has provided a possibility to realise fast neutron imaging having moderate resolution (∼ mm) with a smaller footprint and an economical system design for field applications.

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利用 14 MeV 中子对低 Z 掩蔽高 Z（铅、铀）材料成像

利用 14 MeV 中子对被高密度高 Z 材料厚层掩盖的低 Z 材料（特别是由 C、H、O 元素组成的材料）进行了成像实验研究。实验装置包括一个 D-T 中子发生器、一个金属准直器和一个成像系统。成像系统由一个聚丙烯硫化锌闪烁屏和一个镜头耦合 16 位 ICCD 相机组成。使用带有孔和线对特征的铁测试样品对该系统的成像能力进行了研究。在对比度为 36% 的情况下，可以对最小尺寸为 2 毫米的孔进行成像，在对比度为 24% 的情况下，可以看到宽度为 2 毫米的线，这表明该系统的分辨率为 ∼ 毫米。在厚铅层（40 毫米）和厚铀层（35 毫米）后放置的低 Z 样品，如水（H2O）和聚乙烯（C2H2），也能成功成像。这些图像显示了该系统在较重金属存在的情况下对低 Z 材料成像的能力。D-T 中子发生器的中子产率较低，仅为 5 × 108 n/sec，但却能获得对比度良好的图像，这为实现具有中等分辨率（∼ mm）的快速中子成像提供了可能，同时也为现场应用提供了更小的占地面积和更经济的系统设计。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.