论文部分内容阅读
目的研究不同热处理温度掺杂(Li,Dy,Tm)CaSO_4磷光体的热释光发光特性,确定CaSO_4:Tm,Li和CaSO_4:Dy,Li的最佳热处理温度,揭示热处理温度和杂质对热释光发光特性的影响规律。方法选用CaSO_4:Tm,Li,CaSO_4:Dy,Li和CaSO_4:Tm 3种热释光磷光体探测器,使用2000D型热释光远红外精密程序控制退火炉分别在240、250、260、270、280、290、300℃等7个不同温度下退火,在~(137)Csγ刻度源(55.5GBq)照射相同剂量(0.826mGy)后,使用RGD-3B型热释光剂量仪和Peakfit软件进行测量和分析。结果 CaSO_4:Tm,Li发光曲线的发光峰位置随退火温度的降低而向低温处移动,300℃退火时发光峰峰温最高(167℃),240℃退火时发光峰峰温最低(139℃),最适合的热处理温度为280℃;300℃退火时CaSO_4:Dy,Li的发光曲线发光峰峰温为152℃,260℃和280℃退火时发光峰峰温分别为125℃和124℃,270℃为CaSO_4:Dy,Li最适合的热处理温度;CaSO_4:Tm,Li的发光曲线在150℃左右存在1个发光峰,而CaSO_4:Tm的发光曲线在低温处的发光峰存在于250℃左右,CaSO_4:Tm,Li在高温处的强度明显高于CaSO_4:Tm。结论掺杂CaSO_4磷光体的热释光发光特性明显受热处理温度的影响,并与杂质类型的关系密切,掌握其影响规律可有效改善热释光探测器的灵敏度,为职业人员的个人剂量监测工作提供了可靠的实验基础。
Objective of different heat treatment temperatures dopant (Li, Dy, Tm) CaSO_4 thermoluminescent light emission characteristics of the phosphor, is determined CaSO_4: Tm, Li and CaSO_4: Dy, Li the optimum heat treatment temperature, heat treatment temperature and impurities to reveal thermoluminescence Influence of Light Emission Characteristics. Methods CaSO_4: Tm, Li, CaSO_4: Dy, Li and CaSO_4: Tm 3 species in the phosphor luminescence detector, using optical far 2000D Pyroelectric Infrared precise process control lehr 240,250,260,270, respectively, 280, 290, and 300 ℃. The RGD-3B thermoluminescence dosimeter and Peakfit software were used to measure the same dose (0.826mGy) after irradiating with 137γ Csγ source (55.5GBq) And analysis. Results The luminescence peak of CaSO_4: Tm and Li shifted to low temperature with the decrease of annealing temperature. The peak temperature of the emission peak at CaCO_4: Tm and Li was the highest (167 ℃) when annealed at 300 ℃ and lowest at 139 ℃ , The most suitable heat treatment temperature is 280 ℃. The luminescence peak temperature of CaSO_4: Dy, Li at 300 ℃ is 152 ℃, and the luminescence peaks at 260 ℃ and 280 ℃ are 125 ℃ and 124 ℃, respectively. ℃ is CaSO_4: Dy, Li optimum heat treatment temperature; CaSO_4: Tm, 1 luminescence peak emission curve Li is present at about 150 ℃, and CaSO_4: luminescence curve Tm of the emission peak low temperature is present in 250 ℃ about, CaSO_4: Tm, Li at high temperature intensity was significantly higher than CaSO_4: Tm. Conclusion phosphor doped CaSO_4 thermoluminescent light emission characteristics significantly affected by heat treatment temperature and the type of impurity closely related to the influence of control which can effectively improve the sensitivity of thermoluminescent detector for monitoring the individual dose of the professionals Provide a solid foundation for experimentation.