新型闪烁体的辐照效应

介绍了新型闪烁体辐照效应的研究进展，高能物理实验中使用的闪烁晶体（如ＰＷＯ、ＧＳＯ：Ｃe、CeF3等）用于强辐照环境，要求高辐照硬度。闪本在辐照后可能产生的变化主要有效：色心的形成、光输出改变、光输出均匀性的损伤、输出噪声增加、闪烁机制的变化。辐照效应的产生主要是晶体的缺陷所致，提高闪烁体辐照硬度的主要方法有退火、漂白、掺杂、控制晶体生长条件等，本文对此均作了较系统的综述了，同时也简介了研究辐照效应的实验方法：光谱分析法、热释光法、电子顺磁共振法、正电子湮没技术。

Irradiation Effect of New Scintillators

The scintillators used for high-energy physics experiments will encounter a severe irradiation environment. So the irradiation hardness of scintillators must meet certain requirements. After irradiation, the scintillators will have some changes including the change of scintillation mechanism, the formation of color centers, the change of light output, the damage of light response uniformity, the increase of noise. The irradiation effect of scintillators is caused by the structure defects, such as oxygen vacancies. Doping, optimization of crystal growth parameters and post thermal treatment have been proved to be effective for enhancing the radiation hardness of scintillation crystals. This article introduces the irradiation effects of new scintillators and several usual methods of studying irradiation effects, including optical spectroscopy analysis, thermoluminescence, electron paramagnetic resonance and the technique of positron annihilation.