The effects of high cumulative radiation dose on the luminescence properties of KCl:Eu2+ are investigated. Pellet samples of KCl:Eu2+ were given doses of up to 200 kGy at the Louisiana State University Synchrotron facility. After synchrotron irradiation, samples were optically bleached and given a clinical dose of 2 Gy from a 6 MV medical linear accelerator. Optical properties were evaluated using photostimulated luminescence (PSL), photoluminescence (PL), and temperature-dependent PSL measurements. For a cumulated dose of up to 5-10 kGy, the PSL emission intensity increased by 15% compared to the PSL signal with no radiation history. For doses higher than 10 kGy, the PSL emission intensity retained at least 70% of the original intensity. Spatial correlation of the charge storage centers increased for doses up to 5 kGy and then decreased for higher cumulative doses. Emission band at 975 nm was attributed to transitions of Eu1+. PL spectra showed an intense peak centered at 420 nm for all cumulative doses. The results of this work show that KCl:Eu2+ storage phosphors are excellent reusable materials for radiation therapy dosimetry.

中文翻译：

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具有高累积剂量的 KCl:Eu2+ 的 X 射线存储性能。

研究了高累积辐射剂量对 KCl:Eu2+ 发光特性的影响。在路易斯安那州立大学同步加速器设施中，KCl:Eu2+ 颗粒样品的剂量高达 200 kGy。同步辐射后，样品被光学漂白，并从 6 MV 医用直线加速器给予 2 Gy 的临床剂量。使用光致发光 (PSL)、光致发光 (PL) 和温度相关的 PSL 测量来评估光学特性。对于高达 5-10 kGy 的累积剂量，与没有辐射历史的 PSL 信号相比，PSL 发射强度增加了 15%。对于高于 10 kGy 的剂量，PSL 发射强度至少保留原始强度的 70%。电荷存储中心的空间相关性在剂量高达 5 kGy 时增加，然后在累积剂量较高时降低。975 nm 处的发射带归因于 Eu1+ 的跃迁。对于所有累积剂量，PL 光谱显示集中在 420 nm 的强峰。这项工作的结果表明，KCl:Eu2+ 存储磷光体是用于放射治疗剂量测定的优良可重复使用材料。