Design,Preparation And Performance Of Borosilicate Scintillation Glass For X-ray Detection

Scintillator detector based on scintillator materials for X-ray detection,as one of the important high-energy ray detectors,has very important applications in nuclear medicine,nuclear power plant detection,space particle physics and the interdisciplinary frontier direction of related disciplines.The scintillator,as the core material of the scintillator detector,has a significant impact on the performance of the detector due to its high or low light yield and emission band.At present,among common scintillator materials,the complex preparation process,high production cost,and difficulty in large-scale production of scintillation crystals limit their application.Due to the presence of polycrystalline phases and grain boundaries,scintillation ceramics can cause loss of emitted light,affecting their irradiation hardness and light yield.In contrast,scintillation glass has attracted widespread attention due to its advantages of low cost,simple manufacturing process,and easy formation of any shape and size.However,during the scintillation process,low absorption efficiency and non radiative transitions of high-energy ions often result in low photon emission in the scintillation glass.Scintillation glass is mainly prepared by utilizing various flexible compositions of the glass matrix and incorporating appropriate activating ions.Therefore,the research on improving light yield and fluorescence quenching concentration mainly depends on the selection of inorganic glass composition and doping activation ions.Borosilicate glass has great potential in scintillating glass for X-ray detection because of its good glass forming ability,chemical stability,mechanical stability and thermal radiation stability.In addition,Tb³⁺ions have sharp green light emission,which can well match various commonly used photodetectors.Therefore,a Tb doped borosilicate scintillation glass was designed to achieve strong X-ray absorption,high light yield,and high doping activation ion concentration requirements for X-ray detection.This paper takes Tb³⁺doped borosilicate glass as the research object,and studies the effects of different oxides,rare earth ion doping concentrations,and reducing agents as external bodies of the glass network on the optical scintillation performance of borosilicate glass materials.The main research content is as follows:1)In response to the problem of low light output and low quantum efficiency in scintillation glass,the performance of scintillation glass can be improved by adjusting the oxides in the borosilicate glass system.Gradually replace the position of La³⁺in glass with Sr²⁺and Al³⁺;Lu³⁺ions replace Gd³⁺,improving the quantum efficiency of scintillation glass;The effect of different SrO and Al₂O₃ content ratios on the quantum efficiency and optical properties of Tb³⁺doped borosilicate scintillation glasses was studied.As the SrO content decreases and the Al₂O₃ content increases,the quantum efficiency of the glass sample increases from 68%to 88%;The effect of different Tb₄O₇ doping amounts on the optical and scintillation properties of Tb³⁺doped borosilicate scintillation glasses was studied.2)To solve the problem of the valence distribution of Tb³⁺and Tb⁴⁺in Tb₄O₇ doped borosilicate scintillation glass,the optical and scintillation properties of the samples before and after the addition of SnO were studied on the basis of Tb³⁺doped borosilicate scintillation glass.After adding SnO,the luminescence intensity of scintillation glass under UV and X-ray excitation was significantly improved,and the quantum efficiency increased to 91%.Compared to BGO,the integral scintillation efficiency increased from 65.7%to 72.3%;The changes in optical and scintillation properties of Tb³⁺doped borosilicate scintillation glasses with different concentrations of SnO were studied.When the amount of SnO added increases from 0.25mol%to 2mol%,the emission intensity of the glass sample under X-ray excitation and ultraviolet excitation shows a pattern of first increasing and then decreasing.