掺铈钆镓铝石榴石闪烁晶体辐照效应研究

Effect of Irradiation on Ce:GAGG Scintillation Crystals

摘要:

使用60Co放射源对掺铈钆镓铝石榴石(Ce:GAGG)闪烁晶体样品进行辐照,剂量率为3×105 Rad/h, 辐照总剂量分别为106 Rad 、107 Rad 和108 Rad。通过测试辐照前后Ce:GAGG闪烁晶体样品的透过率、相对光输出、能量分辨率及衰减时间来研究辐照效应。实验结果表明,经过108 Rad辐照,晶体的透过率在450~900 nm波段无明显变化,在320 nm处降幅最大(为8.9%);晶体的光输出降低了1.47%,能量分辨率略有下降;晶体的相对光输出、能量分辨率及衰减时间等性能未发生明显改变。验证了该晶体具有良好的抗γ辐照能力,在高剂量核辐射探测领域中具有广阔的应用前景。

Abstract:

Ce:GAGG scintillation crystal samples were irradiated using a 60Co radiation source at a dose rate of 3×105 Rad/h, and the total irradiation doses delivered to the samples were 106, 107, and 108 Rad. The effects of irradiation were investigated by measuring the transmittance, relative light output, energy resolution, and decay time of the Ce:GAGG scintillation crystal samples before and after irradiation. The experimental results showed that after irradiation at a dose of 108 Rad, the transmittance of the crystal remained unchanged in the 450-900 nm, and the lowest transmittance (8.9%) was detected at 320 nm. The light output of the crystal decreased by 1.47%, whereas the energy resolution deteriorated only slightly. The relative light output, energy resolution, and decay time of the crystal did not change significantly. These results confirm the high resistance of the crystal to γ-ray irra diation and demonstrate its broad application prospects in high-dose nuclear radiation detection.