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气体探测器在辐照下的老化一直为人们所关心。文章报道了分别用~(55)Fe 5.9keV X射线和~(90)Srβ射线对BESⅢ漂移室模型所作辐照老化实验中水汽作用的研究。从阳极电流和~(55)Fe 5.9keV X射线全能光电峰位随累积电荷量的变化,在加有水汽情况下分别得到大单元老化率为-0.06%/(mC/cm)与-0.30%/(mC/cm)及小单元老化率为-0.15%/(mC/cm)与-0.18%/(mC/cm)。并在同一老化实验过程的前后段分别不加水汽和加水汽作了老化率的比较,实验结果显示混合气体中有少量水汽加入有利于减低老化。在老化后的丝室加入水汽后发现水汽对老化后的探测器有一定治疗作用。
Aging of gas detectors under irradiation has always been of concern. In this paper, the effects of water vapor on the radiation aging experiment of BES Ⅲ drift chamber model with ~ (55) Fe 5.9keV X-ray and ~ (90) Srβ ray were reported respectively. From the anode current and the change of cumulative charge of X-ray all-around photoelectric peak of ~ (55) Fe 5.9keV, the aging rates of large unit were -0.06% / (mC / cm) and -0.30% / (mC / cm) and cell aging rates were -0.15% / (mC / cm) and -0.18% / (mC / cm). The comparison of the aging rates without water vapor and water vapor before and after the same aging experiment shows that the addition of a small amount of water vapor in the mixed gas helps to reduce the aging rate. Adding water vapor to the aged chamber leads to the discovery that water vapor has a therapeutic effect on the aged detector.