Cu掺杂四硼酸锂微晶的水热合成及其热释光特性

Thermoluminescence Properties of Lithium Borate Microcrystals Doped with Cu Synthesized by Hydrothermal Method

用水热法制备了Cu掺杂的Li2B4O7(LTB:Cu)微晶,使用XRD和SEM对样品进行了表征,测量和分析了样品的各项热释光性能。运用一般级动力学方程对发光曲线进行解谱,确定其3个剂量峰峰温分别为162、254和366℃,并得到了与3个剂量峰相对应的陷阱参数。结果表明制备的LTB:Cu微晶在很大范围(10～5 000 Gy)内都有着良好的线性响应和很好的重复性,并且可以通过预加热减少衰减的影响。因此制备的LTB:Cu微晶非常适用于高剂量γ射线的测量。同时对比了NaCl共烧结和直接烧结的LTB:Cu微晶的发光曲线,发现NaCl可以有效地提升LTB:Cu微晶的热释光性能。

In the paper, Li2B4 O7microerystals doped with Cu were synthesized by hydrothermal method, TEM and SEM were used to characterize the samples, and thermoluminescence properties of the samples were meas- ured and analyzed. The TL curve of the samples was de - convoluted into three elementary peaks which was at 162 、254 and 366℃ by employing the General Order model, and the trapping parameters corresponding to these peaks were also obtained. The results indicated that the LTB ： Cu microcrystals exhibited very fine linear respon- ses and good reproducibility over a very wide range （10 ~ 5 10^3Gy）, and the impact of the thermoluminescence decay could be reduced by preheating before the measurement. So we could conclude that the Li2 B4 O7 micro- crystals doped with Cu we have obtained could be used for high dose measurements of gamma radiations. Moreo- ver, compared the Li2B4O7 microcrystals co-sintered with NaCI to the microcrystals sintered directly, we can find that the NaCI can improve the thermoluminescence properties of the microcrystals effectively.