A method for the estimation of fissile mass by measuring the number of neutron signals within a specific time interval

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• 作者：C. Dubi^a ; ^{chendb331@gmail.com} ; T. Ridnick^a ; I. Israelashvili^a ; J. Bagi^b ; J. Huszti^c
• 关键词：Neutron detection ; Neutron multiplicity method ; Fissile mass estimation
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2012
• 出版时间：1 May, 2012
• 年：2012
• 卷：673
• 期：Complete
• 页码：111-115
• 全文大小：154 K

文摘

This paper presents a new method for fissile mass estimation by passive neutron interrogation. The method uses the stochastic transport equation to express the first three central moments (mean, variance and skewness) for the number of detected neutrons within a given time interval in terms of the fissile mass, the (,n) rate and the multiplicity factor. Solving these three equations allows estimation of the fissile mass. As the primary validation of the method, it was implemented for several fissile mass measurements, which were conducted by the Nuclear Security Unit of the Joint Research Center (JRC) in Italy and by the Institute of Isotopes in Hungary.