The origin of radiation instability in yttrium-ion-doped lead tungstate crystals

Philosophical Magazine Part B Pub Date : 2002-12-01 DOI:10.1080/13642810208222946

Xin Zhang, J. Liao, Peijun Li, Z. Yin, Xiao-Xu Wu, X. Zong

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引用次数: 2

Abstract

Abstract Some Y3+-doped PbWO4 (PWO:Y3+) crystals grown by the modified Bridgman method showed exceptional behaviours, namely the increase in the light yield after low-dose-rate irradiation and also the improvement in the optical transmission at around 430 nm. In this paper, we studied the influences of high-temperature annealing in an oxygen-rich atmosphere on the stability of scintillation properties and radiation hardness of PWO: Y3+. The results show that annealing in oxygen enhances the absorption band at around 430 nm and makes optical transmission unstable at this wavelength after irradiation. After high-temperature annealing, the radiation-induced absorption coefficient is also negative around 430 nm. The 430 nm absorption band introduced by high-temperature annealing in oxygen has the same characteristics as the pre-existing bands in as-grown PWO: Y3+ crystals. So it decreases the stability of scintillation properties and radiation hardness of PWO: Y3+ crystals. The radiation instability relates to the formation of interstitial oxygen ions (Oi”) during high-temperature annealing. The results reveal that the oxygen-rich atmosphere during the crystal growth and annealing procedure is the origin of the exceptional irradiation behaviours in PWO: Y3+ crystals.

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钇离子掺杂钨酸铅晶体辐射不稳定性的来源

通过改进Bridgman法生长的掺杂Y3+的PbWO4 (ppo:Y3+)晶体表现出了特殊的行为，即低剂量率辐照后产光率增加，430 nm左右的光透射率也有所提高。本文研究了富氧气氛下高温退火对PWO: Y3+闪烁性能稳定性和辐射硬度的影响。结果表明，在氧中退火增强了430 nm左右的吸收带，使辐照后该波长的光传输不稳定。高温退火后，辐射诱导吸收系数在430 nm左右也为负。在氧中高温退火引入的430nm吸收带与生长态ppo: Y3+晶体中已有的吸收带具有相同的特征。从而降低了PWO: Y3+晶体闪烁性能的稳定性和辐射硬度。辐射不稳定性与高温退火过程中间隙氧离子(Oi)的形成有关。结果表明，晶体生长和退火过程中的富氧气氛是导致PWO: Y3+晶体异常辐照行为的原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Philosophical Magazine Part B

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