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dc.contributor.authorMORTREAU PATRICIAen_GB
dc.contributor.authorBERNDT REINHARDen_GB
dc.date.accessioned2010-02-25T18:36:42Z-
dc.date.available2006-02-13en_GB
dc.date.available2010-02-25T18:36:42Z-
dc.date.issued2005en_GB
dc.date.submitted2005-11-09en_GB
dc.identifier.citationNUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP vol. 550 p. 675-690en_GB
dc.identifier.urihttp://publications.jrc.ec.europa.eu/repository/handle/JRC30987-
dc.description.abstractThe traditional method used to determine the Uranium enrichment by nondestructive analysis is based on the “enrichment meter principle” [1]. It involves measuring the intensity of the 186 keV net peak area of 235U in “quasi-infinite” samples. A prominent factor, which affects the peak intensity, is the presence of gamma absorbing material (e.g., container wall, detector cover) between the sample and the detector. Its effect is taken into consideration in a commonly called “wall thickness” correction factor. Often calculated on the basis of approximations, its performance is adequate for small attenuation factors applicable to the case of narrow beams. However these approximations do not lead to precise results when wide non-parallel beams are attenuated through thick container walls. This paper is dedicated to the calculation by numerical integration of the geometrical correction factor (Kwtc) which describes the effective mean path length of the radiation through the absorbing layer. This factor was calculated as a function of various measurement parameters (types and dimensions of the detector, of the collimator and of the shielding) for the most commonly used collimator shapes and detectors. Both coherent scattering (Rayleigh) and incoherent scattering (Compton) are taken into account for the calculation of the radiation interaction within the detector.en_GB
dc.description.sponsorshipJRC.G.8-Nuclear safeguardsen_GB
dc.format.mediumPrinteden_GB
dc.languageENGen_GB
dc.publisherELSEVIER SCIENCE BVen_GB
dc.relation.ispartofseriesJRC30987en_GB
dc.titleAttenuation of a Non-parallel Beam of Gamma Radiation by Thick Shielding- application to the Determination of the 235U Enrichment with NaI Detectorsen_GB
dc.typeArticles in periodicals and booksen_GB
JRC Directorate:Space, Security and Migration

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