热中子探测用Ce:Li6Lu(BO3)3晶体的生长、发光机理和闪烁性能研究

项目名称： 热中子探测用Ce:Li6Lu(BO3)3晶体的生长、发光机理和闪烁性能研究

项目编号： No.51272263

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 潘尚可

作者单位： 宁波大学

项目金额： 80万元

中文摘要： 近几年来，探索能够替代3He气体正比计数器的新型热中子探测材料及器件的研究是国际核辐射探测领域的研究热点。本项目从热中子探测对闪烁晶体的元素组成和性能要求出发，以新型低密度快衰减闪烁晶体Ce:Li6Lu(BO3)3为研究对象，研究其生长、发光机理及闪烁性能。研究提拉法生长晶体过程中固-液界面稳定性的影响因素，生长出直径达30mm的透明无宏观缺陷的晶体；研究晶体中铈离子的价态分布规律及控制机制；研究晶体在紫外光、真空紫外光、X射线、γ射线、α粒子及热中子等辐射激发下的发光机理；研究局域结构的变化对晶体热中子探测性能的影响机制，在此基础上通过离子置换，提高晶体的n-γ甄别能力。本项目的实施，将会促进低对称性高黏度硼酸盐晶体的制备技术和热中子探测用闪烁晶体的性能与局域结构关系的理论研究，并为探索替代3He的新型热中子探测技术提供新的具有应用前景的候选材料。

中文关键词： 热中子探测；提拉法；闪烁晶体；非本征发光；n-γ甄别

英文摘要： In recent years, search for novel neutron detection materials and detectors is a hot research topic in the international nuclear raditation detection research field. According to the requirements of chemical element components and scintillation properties for thermal neutron detection，this project will focus on novel scintillation crystal Ce:Li6Lu(BO3)3 with low density and fast decay time. We will investigate the growth, luminescence mechanism and scintillation properites of Ce:Li6Lu(BO3)3 crystal. Through investigating the effect mechanism of the stability of the solid-liquid interface during the Czochralski growth process, we will be able to grow transparent crystals with diameter of 30mm which have no macro-defects.We will also investigate the distribution and controlling mechanism of the valence value of Ce ions in the crystal, the scintillation mechanism under different radiation sources such as ultraviolet, x-ray, γ-ray, α particles and thermal neutrons. And the adjustment of local structure effect on the scintillation properties and increase of the n-γ discrimination ability. This project will promote the theoretical research on the growth mechanism of Czochralski gorwth of borate crystal with low symmetry and low melting point. It will also helpful to understand the relationship between properties and

英文关键词： thermal neutron detection；Czochralski technique；scintillation crystal；extrinsic luminescence；n-γ discrimination