Title: A novel method for active fissile mass estimation with a pulsed neutron source
Authors: DUBI C.RIDNIK TISRAELASHVILI I.PEDERSEN Bent
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT vol. 715 p. 62-69
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2013
JRC N°: JRC94578
ISSN: 0168-9002
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC94578
DOI: 10.1016/j.nima.2013.03.004
Type: Articles in periodicals and books
Abstract: Neutron interrogation facilities for mass evaluation of Special Nuclear Materials (SNM) samples are divided into two main categories: passive interrogation, where all neutron detections are due to spontaneous events, and active interrogation, where fissions are induced on the tested material by an external neutron source. While active methods are, in general, faster and more effective, their analysis is much harder to carry out. In the paper, we will introduce a new formalism for analyzing the detection signal generated by a pulsed source active interrogation facility. The analysis is aimed to distinct between fission neutrons from the main neutron source in the system, and the surrounding “neutron noise”. In particular, we derive analytic expressions for the first three central moments of the number of detections in a given time interval, in terms of the different neutron sources. While the method depends on exactly the same physical assumptions as known models, the simplicity of the suggested formalism allows us to take into account the variance of the external neutron source—an effect that was so far neglected.
JRC Directorate:Nuclear Safety and Security

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