摘要
通过双掺杂制备杂质浓度不同的ＭｇＳＯ_４：Ｄｙ，Ｍｎ磷光体，经~６０Ｃｏγ辐照后，研究其热释光（ＴＬ）发光曲线、热释光动力学特徵参量，热释光剂量响应和电子自旋共振（ＥＳＲ）谱。从ＴＬ发光曲线观察ＭｇＳＯ_４：Ｄｙ，Ｍｎ只有一个在３８０℃附近的主剂量峰，辐射剂量响应（０．１Ｇｙ～２０ｋＧｙ）为超线性。并观测到热释光剂量响应的非线性与磷光体中掺入的Ｍｎ浓度相关．在室温下测量了掺入不同Ｍｎ浓度的ＭｇＳＯ_４：Ｄｙ，Ｍｎ样品的ＥＳＲ谱，观测和确认了各向异性ＳＯ_３~－基，该硫酸氧基与Ｍｇ空位和掺入的杂质有关．还对掺入Ｄｙ杂质的ＭｇＳＯ_４系列磷光体的热释光发光机制进行了初步探讨。
The MgSO_4: Dy, Mn thermloluminescence (TL) phosphors doped with various concentration levels of the activators are prepared by co-dopant and studied by analyzing thermoluminescence glow curves and dose-responses to gamma-ray and electron spin resonance (ESR). The main dosimetric peak in the TL glow curves of MgSO_4: Dy, Mn is at about 380℃. The dose-response of MgSO4: Dy, Mn to gamma radiation in the range from 0.1 Gy, to 20 kGy are obtained. It is shown that the dose-response of MgSO_4: Dy, Mn is supralinear. The SO_3^- radicals in ESR spectra of MgSO_4: Dy, Mn samples irradiated with gamma rays are identified by the values of g factor. In addition, the TL mechanism in MgSO_4 phosphors doped with Dy is discussed.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2000年第2期32-36,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目!(19775071)
广东省自然科学基金资助项目!(990215)
