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Abstract

The traditional method used to determine the Uranium enrichement by non-destructive analysis is based on th �enrichement meter principle�. Ii involves measuring the intensity of the 186 keV ne peak area of {235}U in 2quasi-infinite� samples. Either simple �window counting� techniques or more elaborated peak fitting procedures aand used to subtract the background continuum caused by high energy gamma rays from the {238}U decay below the 186 keV peak. 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, namely K(wtc). Often calculated on the basis of approximations do lead to precise results when wide non-parallel beams are attenuated through thick container walls.
%The document is a final report on the activity dedicated to the calculation by numerical integration of the wall thickness correction factor (K(wtc)) through a thick shielding for a non-parallel beam of gamma radiation. This factor was calculated as a function of various measurement parameters (types and dimensions of the detector, of the collimator and of the source) 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

Additional information

Authors: BERNDT R, European Commission, Joint Research Centre, Institute for the Protection and the Security of the Citizen, Ispra (IT);MORTREAU P, European Commission, Joint Research Centre, Institute for the Protection and the Security of the Citizen, Ispra (IT)
Bibliographic Reference: EUR 21295 EN (2004), 75pp. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9893 Fax: +39 033278 5409 E-mail: jrc-publications-office@ec.europa.eu or Bruxelles (BE) Tel: +32 2 295 76 24 Fax: +32 2 299 63 22
Record Number: 200417758 / Last updated on: 2004-10-26
Category: PUBLICATION
Original language: en
Available languages: en
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