掺Ag^+硫化锌制备与辐射探测器热压成型工艺参数优化

Synthesis of Silver-doped ZnS Material and Optimization of Thermal Compression Molding Parameters of Radiation Detector

利用纳米材料制备方法将激活剂Ag^+掺杂于ZnS材料中制备了粒径更小的闪烁材料,进一步提高了该闪烁材料的发光效率。将新制备的闪烁材料用于辐射探测器的设计并对热压成型工艺进行优化,以模压温度、模压压力、模压时间为影响因素设计了系列对比实验并将探测效率和外观两个指标作为判断探测器品质的依据。引入外观评分方法,有效解决外观指标的量化问题并获得了最优工艺参数。实验结果表明,重新制备的Ag^+掺杂ZnS闪烁材料,其平均粒径为几十纳米,其发光强度相比普通商用ZnS∶Ag^+粉末得到明显提升。当温度为200℃、压力为7 MPa、时间为10 min时,利用热压成型工艺制备的闪烁体探测效率和外观均达到最优,辐射探测器的综合性能和成品率也得到较大提升。

Scintillation materials were prepared by doping activator Ag+into ZnS materials by nanomaterials preparation method,the luminescence intensity of the scintillation material was further improved.The radiation detector was designed and processed with the newly prepared nano-scintillation material.A series of comparative experiments were designed with temperature,pressure and time as the influencing factors,and the detection efficiency and appearance were taken as the basis to judge the detector quality.The appearance grading method was introduced,the quantitative problems of the above indexes were effectively solved and the optimal process parameters were obtained.Experimental results show that,the average particle size of Ag^+doped ZnS scintillation material prepared again was dozens of nanometers,and its luminescence intensity was significantly improved compared with that of common commercial ZnS∶Ag^+powder.When the mold temperature is 200℃,moulded pressure is 7 MPa and the moulded time is 10 min,the scintillator produced by the optimized process has the best detection efficiency and appearance,and the comprehensive performance and yield of the radiation detectors have been greatly improved.