针对探测器通道和待测核材料探测通道之间相对几何位置与待测核材料富集度变化之间的相互关系问题,开展了基于探测通道间协方差幅值进行核材料富集度判别的研究工作.实验中,选取富集度分别为85.15％,90.15％和93.15％的235U核材料,模拟研究了多个位置不同的探测通道所得到的协方差运算结果.研究结果表明:随着235U核材料富集度的增加,互相关的幅值也随之增大并与国外文献结果相吻合,率先在国内证明了基于探测器相对几何位置变化的探测通道互相关幅值可以推断核材料富集度的可行性.%The paper investigates the relationship between the change of nuclear sample enrichment and the relative position of detectors of the 232Cf source-driven noise analysis system. A Monte Carlo numerical simulation with varied 235U enrichment (85.15%, 90. 15% , 93. 15%) and different relative positions has been conducted, and the cross-covariance between data of paired detectors was calculated. The results show that the amplitude of cross-covariance improves with 23S5 U enrichment, which coincides with reference results. Thus it is feasible to estimate the nuclear material enrichment based on the cross-covariance amplitude of detectors.
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