P.R. González, D. Mendoza-Anaya, L. Escobar-Alarcón, O. Ávila
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引用次数: 0
摘要
研究了掺杂不同稀土的氧化镁的热致发光(TL)响应。TL 材料通过溶液燃烧法合成,并在 1173 K 下烧结;得到的粉末呈颗粒状。辐照前,剂量计在 623 K 下退火 30 分钟,以消除制造过程中产生的任何 TL 信号。在氧化镁中掺入 Tm、Dy、Ce 和 Sm 进行了独立测试。掺入 Sm 的氧化镁(MgO:Sm)的 TL 响应最高,Sm 含量为 0.4 摩尔% 时灵敏度最高。该样品的 TL 响应在 60Co 伽马射线的 0.001 至 500 Gy 范围内呈线性关系。检测下限为 1.17 μGy。MgO:Sm 制备的剂量计的灵敏度约为商用 TLD-100 的 10%。一个月后发现 TL 信号衰减为 6%。辉光曲线的解卷积显示了一个以 474 K 为中心的具有一般阶动力学 b 的对称峰。
TL response of Sm-doped MgO to 60Co gamma radiation
The thermoluminescent (TL) response of MgO doped with different rare earths was investigated. The TL material was synthesized by the solution combustion method and sintered at 1173 K; the obtained powders were prepared in pellet form. Before irradiation, the dosimeters were annealed at 623 K for 30 min to eliminate any TL signal generated during their manufacture. Independent tests were performed doping the MgO with Tm, Dy, Ce and Sm. The highest TL response was found for Sm-doped MgO (MgO:Sm) reaching the highest sensitivity for 0.4 mol% of Sm. For this sample, the TL response showed linearity from 0.001 to 500 Gy of 60Co gamma radiation. The lower detection limit was found to be equal to 1.17 μGy. The sensitivity of the MgO:Sm prepared dosimeter was approximately 10% the sensitivity of the commercial TLD-100. The TL signal fading was found to be 6% after one month. The deconvolution of the glow curve showed a symmetric peak with a general order kinetics, b, centered at 474 K. These results suggest that this new TL material could be a promising detector to use in diverse dosimetry applications.
期刊介绍:
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