强辐射对Yb∶YAG超快无机闪烁探测器灵敏度影响的实验测量  

Experimental Measurement for the Influence of Strong Radiation on the Ultrafast Yb∶ YAG Scintillation Detector

作　　者：胡孟春[1] 李忠宝[1] 甫跃成[1] 刘建[1] 唐登攀[1] 李如荣[1] 王文川[1] 黄雁[1] 陈力雄 蒋树庆[1] 张建华[1] 蒋世伦[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《人工晶体学报》2016年第3期597-603,共7页Journal of Synthetic Crystals

基　　金：中国工程物理研究院科研项目(902-301)

摘　　要：为了给强脉冲辐射场中应用超快闪烁探测器进行精密物理测试以及相关晶体抗核加固提供实验测量数据参考,针对近年新研制的Yb∶YAG超快无机闪烁体与GD40光电管构成的快闪烁探测器,在源强近万居的强稳态辐照场中,细致测量了辐射累计伽马剂量从约1 Gy开始到最高约1 k Gy全过程中Yb∶YAG超快闪烁探测器输出电流的变化数据;在测点注量率大于1017cm-2·s-1的"强光一号"短γ脉冲辐射场中,测量了Yb∶YAG超快闪烁探测器输出脉冲波形响应情况。实验测量结果表明:在强稳态辐射场情况下,对应累计剂量5~10Gy时,YAG(Yb)闪烁探测器灵敏度下降约5~10%(相对辐照1 Gy时的情况);测点累计伽马剂量约1 k Gy时,Yb∶YAG超快闪烁探测器的电流输出与约1 Gy时的比值约50%;短γ脉冲辐射情况下,测点累计注量约4×109cm-2,Yb∶YAG超快闪烁探测器输出电流约1 A时,灵敏度下降约10%(相对累计注量约3×109cm-2的情况),当测点注量大于1010cm-2(累积剂量超过100 m Gy),Yb∶YAG超快闪烁探测器会出现较明显的损伤现象。In order to supply experimental data for precise physical tests where ultrafast scintillation detectors are used under the strong pulse radiation field,and to supply experimental data for the radioresistance of the correlative crystal,scintillation detectors were built up of the Yb∶ YAG crystals and the GD40 photoelectric cells,and their output currents were measured for different doses in the range from 1 Gy to 1 k Gy under a strong steady radiation field,and also their output pulse waveforms were recorded under the ' Qiangguang-1' γ pulse radiation field where the fluence rate at the measuring point is greater than 1017cm- 2·s- 1. As is shown in the results,under the steady field,the sensitivity of the Yb∶ YAG detector goes down by 5-10% when the dose is 5-10 Gy( compared to when the dose is 1 Gy);the sensitivity for the dose of 1 k Gy is 50% of the sensitivity for the dose of 1 Gy. Under γ pulse radiationfield,the output current of the Yb ∶ YAG detector is about 1 A,and the sensitivity of it goes down by about 10% when the cumulative fluence is about 4 × 109cm- 2( compared to when the cumulative fluence is about 3 × 109cm- 2). The Yb∶ YAG detector is damageed obviously if the fluence at the measuring point is greater than 1010cm- 2( the cumulative fluence is greater than 100 m Gy).

关 键 词：辐射探测 无机闪烁体 Yb∶YAG 辐照损伤 强光一号 

分 类 号：TL812[核科学技术—核技术及应用]