Title: Nal Gammm Spectrometry of Shielded Uranium - Limits and New Approach of Uranium Identification
Citation: Proceedings of the 27th ESARDA Symposium on Safeguards and Nuclear Material Management vol. Session 5 p. Paper 4
Publisher: European Safeguards Research and Development Association (ESARDA)
Publication Year: 2005
JRC N°: JRC30899
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30899
Type: Articles in periodicals and books
Abstract: The detection of uranium is of greatest interest because it is the type of nuclear material so far mostly encountered in illicit trafficking. However, its detection and identification is generally difficult and sometimes even impossible, especially if the uranium is highly enriched and concealed under shielding. In this paper we will present a complete study of the uranium gamma spectra seen by a typical hand-held monitor with a NaI detector through various shielding materials. Resulting gamma spectra were both obtained experimentally and by Monte Carlo simulation studies. From a review of the spectral data we propose a new approach for the identification of uranium which makes also use of the shape of the measured gamma continuum observed from shielded uranium. This complementary information can be helpful in cases of poor statistical data for the full photon energy peaks of uranium gamma rays. The applicability and limitations of this analysis approach will be discussed.
JRC Directorate:Nuclear Safety and Security

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