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基于全浓缩硼酸锂的新型柔韧、贴合的复合中子闪烁体。

Novel flexible and conformable composite neutron scintillator based on fully enriched lithium tetraborate.

机构信息

Department of Physics and Astronomy "Galileo Galilei", University of Padova, Padua, Italy.

Laboratori Nazionali di Legnaro, INFN, Legnaro, Italy.

出版信息

Sci Rep. 2023 Mar 23;13(1):4799. doi: 10.1038/s41598-023-31675-9.

DOI:10.1038/s41598-023-31675-9
PMID:36959323
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10036633/
Abstract

Thermal neutron detection is a key subject for nuclear physics research and also in a wide variety of applications from homeland security to nuclear medicine. In this work, it is proposed a novel flexible and conformable composite thermal neutron scintillator based on a fully enriched Lithium Tetraborate preparation ([Formula: see text]Li[Formula: see text]B[Formula: see text]O[Formula: see text]) combined with a phosphorescent inorganic scintillator powder (ZnS:Ag), and is then distributed into a polydimethylsiloxane matrix. The proposed scintillator shows a good neutron detection efficiency (max. [Formula: see text] 57% with respect to the commercial EJ-420), an average light output of [Formula: see text] 9000 ph/neutron-capture, a remarkable insensitivity to [Formula: see text]-rays (Gamma Rejection Ratio <10[Formula: see text]), and an extraordinary flexibility, so as to reach extremely small curvature radii, down to 1.5 mm, with no signs of cracking or tearing. Its characteristics make it suitable to be employed in scenarios where non-standard geometries are needed, for example, to optimize the detector performance and/or maximize the detection efficiency. Finally, the response of a hybrid detector made of a plastic scintillator, wrapped with the proposed scintillator, coupled to a silicon photomultiplier array is described, and the excellent discrimination between [Formula: see text]-rays, fast and thermal neutrons resulting from data processing is demonstrated.

摘要

热中子探测是核物理研究的一个关键课题，同时也广泛应用于从国土安全到核医学等各个领域。在这项工作中，提出了一种新颖的灵活和顺应性复合热中子闪烁体，基于完全浓缩的四硼酸锂制备（[Formula: see text]Li[Formula: see text]B[Formula: see text]O[Formula: see text]）与磷光无机闪烁体粉末（ZnS:Ag）结合，然后分布在聚二甲基硅氧烷基质中。所提出的闪烁体表现出良好的中子探测效率（相对于商用 EJ-420 的最大值[Formula: see text] 57%），平均光输出为[Formula: see text] 9000 ph/中子俘获，对[Formula: see text]射线的显著不敏感性（伽马拒绝比<10[Formula: see text]），以及非凡的柔韧性，可达到极小的曲率半径，低至 1.5 毫米，没有开裂或撕裂的迹象。其特性使其适用于需要非标准几何形状的场景，例如优化探测器性能和/或最大程度地提高探测效率。最后，描述了由塑料闪烁体包裹所提出的闪烁体制成的混合探测器的响应，并通过数据处理证明了[Formula: see text]射线、快中子和热中子之间的出色区分。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/e970cbb6e722/41598_2023_31675_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/aa2cd7841d65/41598_2023_31675_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/fd35775d56e8/41598_2023_31675_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/94f98c18fd23/41598_2023_31675_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/7eed4d578eab/41598_2023_31675_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/13c1099e4387/41598_2023_31675_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/33e0a65ba4d9/41598_2023_31675_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/9d8196232ce4/41598_2023_31675_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/66b42053ba0f/41598_2023_31675_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/26e7f94fe6f0/41598_2023_31675_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/3cd2099a5c64/41598_2023_31675_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/e970cbb6e722/41598_2023_31675_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/aa2cd7841d65/41598_2023_31675_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/fd35775d56e8/41598_2023_31675_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/94f98c18fd23/41598_2023_31675_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/7eed4d578eab/41598_2023_31675_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/13c1099e4387/41598_2023_31675_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/33e0a65ba4d9/41598_2023_31675_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/9d8196232ce4/41598_2023_31675_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/66b42053ba0f/41598_2023_31675_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/26e7f94fe6f0/41598_2023_31675_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/3cd2099a5c64/41598_2023_31675_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9f18/10036633/e970cbb6e722/41598_2023_31675_Fig11_HTML.jpg

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