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在中子物理实验研究中,铀镀层质量厚度的测量直接影响实验结果的不确定度,所以需准确地定量实验中所用转换靶(浓缩铀镀片和贫化铀镀片)铀镀层的质量厚度。为了准确定量铀镀层的质量厚度,设计建立了背对背电离室、小立体角定量装置及大面积金硅面垒半导体探测器三种定量系统。采用这三种定量方式对铀镀层进行准确定量,并对定量结果进行了不确定度分析,定量结果满足了实验要求。由于铀镀层的不均匀对定量的结果有一定的影响,为了评估铀镀层不均匀所带来的影响,对铀镀层进行了均匀性检测,结果表明实验中所用铀镀层均匀性很好。
In the neutron physics experiment, the measurement of uranium coating thickness directly affects the uncertainty of experimental results. Therefore, the mass thickness of the uranium coating used in the experiments (uranium enrichment plates and uranium depleted plates) should be accurately quantified . In order to accurately quantify the mass thickness of uranium coating, three quantitative systems of back-to-back ionization chamber, small solid angle quantitative device and large area gold-silicon surface barrier semiconductor detector were designed. Uses these three kinds of quantitative methods to carry on the accurate quantification to the uranium coating, and carries on the uncertainty analysis to the quantitative result, the quantitative result has satisfied the experiment request. Unevenness of uranium coating has a certain impact on the quantitative results. To evaluate the effect of uranium unevenness, the homogeneity of uranium coating was tested. The results show that the uniformity of uranium coating used in the experiment is very good.