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实验结果表明:本文给出的探测器对快中子辐射损伤的灵敏度相当高。当累积中子通量为6.22×10~8cm~(-2)时,探测器对~(60)Co 1.33MeV γ射线的能量分辨(FWHM)大幅度变坏,为辐射损伤前的三倍;观察到了损伤后的能量分辨的瞬态变化现象;用~(137)C662keV的γ射线扫描技术从实验上再次证明了快中子辐射在探测器中产生空穴陷阱,导致能量分辨变坏。采用简单的净化漂移方法,能恢复损伤过的探测器的性能。
Experimental results show that the detector given in this paper has a high sensitivity to fast neutron radiation damage. When the cumulative neutron flux is 6.22 × 10 ~ 8cm ~ (-2), the energy resolution (FWHM) of ~ (60) Co 1.33MeV γ - rays of the detector greatly deteriorates, which is three times of that before radiation injury. The phenomenon of energy-resolved transient changes after the damage was observed. The γ-ray scanning technique of ~ (137) C662keV proved once again that the fast neutron radiation produced hole traps in the detector, resulting in the deterioration of energy resolution. Using a simple purification drift method, can restore the damaged detector performance.