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改进了CaS∶Eu,Sm荧光粉在实时剂量计系统中的稳定性和实用性。以不同体积的正硅酸乙酯作为前驱体,采用溶胶凝胶法对CaS∶Eu,Sm荧光粉进行表面包覆。分别使用荧光分光光度计和酸度计对荧光粉的发光特性和防水特性进行表征。实验结果显示当质量分数为5%时,包覆层能明显提高荧光粉的稳定性且不影响荧光粉的发光强度。从材料的光激励发光和剂量响应测试实验中可以得出材料的退火特性以及相应的辐射剂量值。以CaS∶Eu,Sm荧光粉为基础的辐射剂量测试系统显示在0.1～300 Gy范围内具有良好的线性关系。结果显示表面包覆层明显抑制光激励发光特性,而且随着辐射剂量的增加,这种影响愈来愈显著。最后,我们提出了以光激励发光技术为基础的辐射剂量在线测试改进系统。
The stability and practicability of CaS: Eu, Sm phosphor in real-time dosimeter system are improved. With different volumes of TEOS as precursors, CaS: Eu, Sm phosphors were surface-coated by sol-gel method. Fluorescence spectrophotometer and pH meter were used to characterize the luminescent and water-repellent properties of the phosphor. The experimental results show that when the mass fraction of 5%, the coating can significantly improve the stability of the phosphor and does not affect the luminescence intensity of the phosphor. The annealing properties of the material and the corresponding radiation dose values can be derived from the photo-stimulated luminescence and dose response test of the material. The radiation dosimetry system based on CaS: Eu, Sm phosphors showed a good linearity in the range of 0.1-300 Gy. The results show that the surface coating significantly inhibits the photo-excited luminescence properties, and this effect is more and more pronounced as the radiation dose increases. Finally, we propose an improved on-line radiation dose testing system based on photoexcitation luminescence technology.