Title: Fissile mass estimation by pulsed neutron source interrogation
Authors: ISRAELASHVILI ItamarDUBI C.ETTEDGUI HananiaOCHERASHVILI AharonPEDERSEN BentBECK ArieROESGEN EricCROCHEMORE Jean-MichelRIDNIK TYAAR I
Citation: NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT vol. 785 p. 14-20
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2015
JRC N°: JRC94483
ISSN: 0168-9002
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC94483
DOI: 10.1016/j.nima.2015.02.048
Type: Articles in periodicals and books
Abstract: Passive methods for detecting correlated neutrons from spontaneous fissions (e.g. multiplicity and SVM) are widely used for fissile mass estimations. These methods can be used for fissile materials that emit a significant amount of fission neutrons (like plutonium). Active interrogation, in which fissions are induced in the tested material by an external continuous source or by a pulsed neutron source, has the potential advantages of fast measurement, alongside independence of the spontaneous fissions of the tested fissile material, thus enabling uranium measurement. Until recently, using the multiplicity method, for uranium mass estimation, was possible only for active interrogation made with continues neutron source. Pulsed active neutron interrogation measurements were analyzed with techniques, e.g. differential die away analysis (DDA), which ignore or implicitly include the multiplicity effect (self-induced fission chains). Recently, both, the multiplicity and the SVM techniques, were theoretically extended for analyzing active fissile mass measurements, made by a pulsed neutron source. In this study the SVM technique for pulsed neutron source is experimentally examined, for the first time. The measurements were conducted at the PUNITA facility of the Joint Research Centre in Ispra, Italy. First promising results, of mass estimation by the SVM technique using a pulsed neutron source, are presented.
JRC Directorate:Nuclear Safety and Security

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