Title: Photon Attenuation and Neutron Moderation Correction Factors for the Inspection of Cargo Containers with Tagged Neutrons
Authors: CARASCO CedricPEROT BertrandVIESTI G.VALKOVIC V.SUDAC D.BERNARD S.MARIANI A.SZABO J-LSANNIE G.LUNARDON M.BOTTOSSO C.MORETTO S.PESENTE S.PEERANI PAOLOSEQUEIRA VITORSALVATO MARTINO
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP vol. 582 no. 2 p. 638-643
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2007
JRC N°: JRC41171
ISSN: 0168-9002
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC41171
DOI: 10.1016/j.nima.2007.09.002
Type: Articles in Journals
Abstract: The EURopean Illicit TRAfficking Countermeasures Kit (EURITRACK) inspection system uses 14MeV neutrons produced by the D(T,n a) reaction to detect explosives in cargo containers. Fast-neutron-induced reactions inside the container produce gamma rays, which are detected in coincidence with the associated alpha particle. The definition of the neutron path and the time-of-flight measurement allow positioning the source of the gamma ray inside the container, while the chemical composition of the target material is correlated with the energy spectrum of the coincident gamma rays. However, in case of dense cargo, neutron moderation and photon attenuation inside the container make difficult the reconstruction of the material composition from the measured gamma-ray energy spectrum. An analytical method has been developed and validated against experimental data, which allows obtaining the chemical carbon-to-oxygen and carbon-to-nitrogen ratios of the inspected items from the gamma-ray energy spectra. The principle of the method is presented along with validation tests.
JRC Institute:Institute for the Protection and Security of the Citizen

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