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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Thermoluminescence characteristics of BaB_4O_7:Dy phosphor
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Thermoluminescence characteristics of BaB_4O_7:Dy phosphor

机译：BaB_4O_7：Dy荧光粉的热致发光特性

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摘要

The polycrystalline powder samples of dysprosium-doped BaB_4O_7:Dy phosphor were prepared by a solid-state reaction in air at high temperature and the thermoluminescence (TL) glow curves and three-dimensional (3D) TL emission spectrum after ~(60)Co gamma-ray irradiation was studied in the 20-130 kGy dose range at 293 K. The emission bands about at 480, 575, 660 and 750 nm were observed in the three-dimensional (3D) emission spectrum. The 3D TL emission spectrum of the BaB_4O_7:Dy is attributed to the characteristic emission from transitions of Dy~(3+) ion. That no emission spectrum is observed for Dy~(2+) ions is probably due to the emission wavelengths lying outside the measurement range. The distributions of traps produced by the irradiation of gamma-ray can be altered greatly by the change of the concentrations of Dy~(3+) ion doped in BaB_4O_7 and peaks temperatures shift to higher temperature, this will be favorable for TL output. The depth of trap E of the main peak of BaB_4O_7:Dy is calculated as 1.38 eV. The influence of the ~(60)Co gamma-ray irradiation doses on thermoluminescence of BaB_4O_7:Dy phosphor and the order of kinetics of TL glow peaks were also discussed. The TL-dose response of the BaB_4O_7:Dy polycrystalline powder sample to gamma-ray radiation in the range from 1 to 100 Gy for clinical dose levels is almost linearity. The experiment results showed that BaB_4O_7:Dy potential use as the materials of gamma-ray thermoluminescence dosimeter (TLD) for clinical dosimetry.
机译：high掺杂的BaB_4O_7：Dy荧光粉的多晶粉末样品是通过在空气中在高温下进行固相反应制备的，并且在〜（60）Coγ射线后有热致发光（TL）辉光曲线和三维（3D）TL发射光谱。在293 K的20-130 kGy剂量范围内研究了X射线辐射。在三维（3D）发射光谱中观察到大约480、575、660和750 nm的发射带。 BaB_4O_7：Dy的3D TL发射光谱归因于Dy〜（3+）离子跃迁的特征发射。 Dy〜（2+）离子未观察到发射光谱，可能是由于发射波长超出了测量范围。通过改变BaB_4O_7中掺杂的Dy〜（3+）离子的浓度，使峰射线温度升高，可以极大地改变γ射线辐照产生的陷阱的分布，有利于TL的输出。 BaB_4O_7：Dy主峰的陷阱E的深度计算为1.38 eV。还讨论了〜（60）Coγ射线辐照剂量对BaB_4O_7：Dy荧光粉热致发光的影响以及TL发光峰的动力学顺序。对于临床剂量水平，BaB_4O_7：Dy多晶粉末样品对γ射线辐射的TL剂量响应在1到100 Gy范围内几乎是线性的。实验结果表明，BaB_4O_7：Dy可用作伽马射线热释光剂量计（TLD）的临床剂量学材料。

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