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研究了有源符合中子法测量不同试样中高浓铀的方法和技术。将１个高计数率符合中子计数器改装为有源井型符合中子计数器装置，测量由Ａｍ－Ｌｉ中子源发射的中子诱发物料中的２３５Ｕ裂变时产生的裂变中子，以确定物料中２３５Ｕ含量。用Ｕ３Ｏ８粉末工作样品进行了探测效率刻度，在５００ｇＵ３Ｏ８粉末范围内，以快中子方式测量的刻度曲线近似线性。实测了含铀粉末不同形态、氧化程度各异的多种试样，给出了试样的形态、密度、碳含量及轴向和径向分布不均匀性等因素引起的各种误差，并进行了实验校正。实验结果表明：测量误差在４％—１１％之间，大部分数据与常规重量法在９％内符合。试样中碳含量对测量结果影响较大。
The methods and techniques of active coincidence neutron spectrometry for measuring HEU in different samples were studied. A high count rate conformed neutron counter was retrofitted to an active well-type conformance neutron counter device to measure fission neutrons generated during 235U fission in a neutron-induced material emitted by an Am-Li neutron source to determine the material In 235U content. U3O8 powder working samples were probed efficiency scale, in the range of 500gU3O8 powder, measured by fast neutron mode calibration curve is approximately linear. A variety of samples containing different forms of uranium powder and different degrees of oxidation were measured. Various errors caused by factors such as the morphology, density, carbon content and axial and radial uneven distribution of the sample were given and carried out The experimental calibration. The experimental results show that the measurement error is between 4% and 11%, and most of the data agree with the conventional weight method within 9%. The carbon content of the sample has a greater impact on the measurement results.