符合中子法测量贫化铀部件质量技术研究

分别采用有源（主动）及无源（被动）符合中子法研究了贫化铀半球壳部件质量的测量方法与技术。采用井型中子符合计数器对不同质量的贫化铀部件进行了符合中子计数的测量，主动法测量选取Am-Be源作为诱发中子源，通过屏蔽体减小源中子偶然符合计数的影响，根据测量结果求出的贫化铀部件线性拟合质量与标称质量最大相对偏差达11.71%，而被动法测量的拟合质量最大相对偏差仅为4.05%。证明了由于与主动法相比减弱了形状的影响，采用被动法测量贫化铀部件质量精度更高且更为可靠。

Mass Measurement of Depleted Uranium Components With Coincidence Neutron Count

The technique of the mass measurement of depleted uranium components was studied with active and passive coincidence neutron count.A well neutron coincidence counter was used to measure the coincidence neutron counts of the depleted uranium components with various mass.Am-Be source was selected as the external neutron source for induced fission in the active measurement,and a shield was optimized to reduce the accidental coincidence counts.In the active measurement,the maximum relative deviation of the linear fit mass from the nominal mass of the depleted uranium components is 11.71%,compared to 4.05% in the passive measurement.It is proved that because of the weakening of the shape influence,the passive method is more accurate and reliable to measure the mass of depleted uranium components than the active method.