摘要:
本文探讨了α-Al2O3：C晶态粉体的辐照剂量效应,使用RisφTL/OSI-DA-15型热释光和光释光仪研究其热释光和光释光特性,结果发现,相同粒径的α-Al2O3：C态粉体具有单一热释光峰,且随着辐照剂量的增加热释光强度不断增加,但热释光峰位置保持不变,符合一级动力学模型;而在相同的辐照剂量和测试条件下,随着α-Al2O3：C态粉体粒径的减小,其热释光强度先增强后减弱,热释光峰却逐渐增加至趋于稳定,表明粒度为40—60μm的α-Al2O3：C态粉体具有最佳的热释光效应.同时α-Al2O3：C态粉体的光释光特性的研究发现,其光释光曲线具有典型的指数衰减特征,粒径对其光释光强度和衰减速率的影响符合浅电子陷阱能级理论.
Abstract:
In this work,we first report on the radiation dose effect ofα-Al2O3：C crystal powder.The thermoluminescence（TL） and optically stimulated luminescence（OSL） of the powder are investigated by Ris0TL/OSL-DA-15.The as-grownα-Al2O3：C crystal powder of same particle size shows a single TL peak and the TL intensity increases as irradiation dose increases,but no shift of the position of the TL peak is found,which is consistent with first-order recombination kinetics.And in the same radiation dose and test conditions, with the particle size ofα-Al2O3：C crystal powder decreasing,the TL intensity decreases after first increase and then the TL peak is gradually increases and approaches to a stable value,which shows that theα-Al2O3：C crystal powder,40—60μm in diameter,has the best TL effect.The OSL decay curve ofα-Al2O3：C crystal powder shows the typical exponential decay characteristics,and the relationship between OSL intensity and decay rate with the particle size ofα-Al2O3：C crystal powder is found to be consistent with the shallow-electronic-trap theory.
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