掺碳氧化铝复合光释光探测器制备及性能测试

Development and Characterization of Composite Optically Stimulated Luminescence Detector Based onα-Al_(2)O_(3):C

针对单晶片状掺碳氧化铝光释光探测器灵敏度差异性大的问题,研究了不同粒径掺碳氧化铝粉体的光释光灵敏度,采用光学类环氧树脂和掺碳氧化铝粉末制备了两种复合掺碳氧化铝光释光探测器,并测试了其光释光剂量响应、最小可测剂量和重复性能。结果表明,在粉体粒径为200~300μm时,具有最高的光释光灵敏度;复合光释光探测器剂量响应呈线性-超线性的特点,剂量10 Gy以下呈良好的线性,最小可测剂量低至33.7μGy;复合光释光探测器响应具有良好的重复使用特性,变异系数小于1.5%。验证了复合光释光探测器的技术可行性,为掺碳氧化铝晶体的应用提供了一条新的路径。

To overcome the inherent variability in sensitivity ofα-Al_(2)O_(3):C single crystal,the effect of grain size on the optically stimulated luminescence(OSL)ofα-Al_(2)O_(3):C powder was investigated,and two kinds of composite OSL detectors were manufactured by mixing theα-Al_(2)O_(3):C powder and optical epoxy,and the dose response,minimum detectable dose and repeatability of the of composite OSL detectors were measured.The OSL intensity of theα-Al_(2)O_(3):C powder exhibited a maximum when the grain size ofα-Al_(2)O_(3):C powder was 200-300μm.The OSL response to dose of the composite OSL detectors shows a linear behavior up to 10 Gy and becomes supra-linear for high dose.The minimum detectable dose was low to 33.7μGy.The composite OSL detectors have good reuse characteristics,and the coefficient of variation is less than 1.5%.The technical feasibility of the composite OSL detector is verified,which provides a new path for the application of theα-Al_(2)O_(3):C crystal.