Nguyen Duy Quang , Phan Quoc Vuong , Nguyen Thanh Luan , Lam Tan Truc , Nguyen Duc Ton , S.C. Kang , Hwanbae Park , Uk-Won Nam , Won-Kee Park , Jongdae Sohn , Young-Jun Choi , Sukwon Youn , Sung-Joon Ye , Sunghwan Kim , Hongjoo Kim
{"title":"用于月球表面热中子和表热中子探测的 6LiI:Ag 晶体闪烁体的生长和特性分析","authors":"Nguyen Duy Quang , Phan Quoc Vuong , Nguyen Thanh Luan , Lam Tan Truc , Nguyen Duc Ton , S.C. Kang , Hwanbae Park , Uk-Won Nam , Won-Kee Park , Jongdae Sohn , Young-Jun Choi , Sukwon Youn , Sung-Joon Ye , Sunghwan Kim , Hongjoo Kim","doi":"10.1016/j.jcrysgro.2024.127692","DOIUrl":null,"url":null,"abstract":"<div><p>This paper discusses crystal growth and characterization of 1.0-inch <sup>6</sup>LiI:Ag scintillators for thermal and epithermal neutron detection on the lunar surface as part of the Lunar Vehicle Radiation Dosimeter project. Zone purification method was employed to purify the raw material of <sup>6</sup>LiI, and the crystals were grown using the Bridgman method. X-ray luminescence spectrum was measured to confirm the presence of Ag<sup>+</sup> in the crystal lattice of <sup>6</sup>LiI. The feasibility of neutron detection under <sup>252</sup>Cf fast neutron irradiation was investigated. A hydrogen-rich paraffin wax moderator was used to slow down fast neutrons to obtain thermal and epithermal neutrons. The charge comparison method was used to perform pulse shape discrimination. The maximum value of the Figure of Merit was obtained to be 1.3, which demonstrates the capability of using <sup>6</sup>LiI:Ag crystal scintillators in high neutron and gamma mixed fields. The energy resolution of the thermal neutron peak varied with the thickness of scintillators, achieving 12.0 % for the 0.5 cm thick samples. The potential for further improvement of the scintillation performance of <sup>6</sup>LiI:Ag crystal relies on reducing impurities and color centers.</p></div>","PeriodicalId":353,"journal":{"name":"Journal of Crystal Growth","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Growth and characterization of 6LiI:Ag crystal scintillators for thermal and epithermal neutron detection on the lunar surface\",\"authors\":\"Nguyen Duy Quang , Phan Quoc Vuong , Nguyen Thanh Luan , Lam Tan Truc , Nguyen Duc Ton , S.C. Kang , Hwanbae Park , Uk-Won Nam , Won-Kee Park , Jongdae Sohn , Young-Jun Choi , Sukwon Youn , Sung-Joon Ye , Sunghwan Kim , Hongjoo Kim\",\"doi\":\"10.1016/j.jcrysgro.2024.127692\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This paper discusses crystal growth and characterization of 1.0-inch <sup>6</sup>LiI:Ag scintillators for thermal and epithermal neutron detection on the lunar surface as part of the Lunar Vehicle Radiation Dosimeter project. Zone purification method was employed to purify the raw material of <sup>6</sup>LiI, and the crystals were grown using the Bridgman method. X-ray luminescence spectrum was measured to confirm the presence of Ag<sup>+</sup> in the crystal lattice of <sup>6</sup>LiI. The feasibility of neutron detection under <sup>252</sup>Cf fast neutron irradiation was investigated. A hydrogen-rich paraffin wax moderator was used to slow down fast neutrons to obtain thermal and epithermal neutrons. The charge comparison method was used to perform pulse shape discrimination. The maximum value of the Figure of Merit was obtained to be 1.3, which demonstrates the capability of using <sup>6</sup>LiI:Ag crystal scintillators in high neutron and gamma mixed fields. The energy resolution of the thermal neutron peak varied with the thickness of scintillators, achieving 12.0 % for the 0.5 cm thick samples. The potential for further improvement of the scintillation performance of <sup>6</sup>LiI:Ag crystal relies on reducing impurities and color centers.</p></div>\",\"PeriodicalId\":353,\"journal\":{\"name\":\"Journal of Crystal Growth\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.7000,\"publicationDate\":\"2024-04-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Crystal Growth\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0022024824001271\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CRYSTALLOGRAPHY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Crystal Growth","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022024824001271","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}
Growth and characterization of 6LiI:Ag crystal scintillators for thermal and epithermal neutron detection on the lunar surface
This paper discusses crystal growth and characterization of 1.0-inch 6LiI:Ag scintillators for thermal and epithermal neutron detection on the lunar surface as part of the Lunar Vehicle Radiation Dosimeter project. Zone purification method was employed to purify the raw material of 6LiI, and the crystals were grown using the Bridgman method. X-ray luminescence spectrum was measured to confirm the presence of Ag+ in the crystal lattice of 6LiI. The feasibility of neutron detection under 252Cf fast neutron irradiation was investigated. A hydrogen-rich paraffin wax moderator was used to slow down fast neutrons to obtain thermal and epithermal neutrons. The charge comparison method was used to perform pulse shape discrimination. The maximum value of the Figure of Merit was obtained to be 1.3, which demonstrates the capability of using 6LiI:Ag crystal scintillators in high neutron and gamma mixed fields. The energy resolution of the thermal neutron peak varied with the thickness of scintillators, achieving 12.0 % for the 0.5 cm thick samples. The potential for further improvement of the scintillation performance of 6LiI:Ag crystal relies on reducing impurities and color centers.
期刊介绍:
The journal offers a common reference and publication source for workers engaged in research on the experimental and theoretical aspects of crystal growth and its applications, e.g. in devices. Experimental and theoretical contributions are published in the following fields: theory of nucleation and growth, molecular kinetics and transport phenomena, crystallization in viscous media such as polymers and glasses; crystal growth of metals, minerals, semiconductors, superconductors, magnetics, inorganic, organic and biological substances in bulk or as thin films; molecular beam epitaxy, chemical vapor deposition, growth of III-V and II-VI and other semiconductors; characterization of single crystals by physical and chemical methods; apparatus, instrumentation and techniques for crystal growth, and purification methods; multilayer heterostructures and their characterisation with an emphasis on crystal growth and epitaxial aspects of electronic materials. A special feature of the journal is the periodic inclusion of proceedings of symposia and conferences on relevant aspects of crystal growth.