Conversion factors from counts to chemical ratios for the EURITRACK tagged neutron inspection system (CROSBI ID 177032)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
El Kanawati, W. ; Perot, B. ; Carasco, C. ; Eleon, C. ; Valković, Vladivoj ; Sudac, Davorin ; Obhođaš, Jasmina
engleski
Conversion factors from counts to chemical ratios for the EURITRACK tagged neutron inspection system
The EURopean Illicit TRAfficking Countermeasures Kit (EURITRACK) uses 14 MeV neutrons produced by the 3H(d, n)4H fusion reaction to detect explosives and narcotics in cargo containers. Reactions induced by fast neutrons produce gamma rays, which are detected in coincidence with the associated alpha particle to determine the neutron direction. In addition, the neutron path length is obtained from a time-of-flight measurement, thus allowing the origin of the gamma rays inside the container to be determined. Information concerning the chemical composition of the target material is obtained from the analysis of the energy spectrum. The carbon, oxygen, and nitrogen relative count contributions must be converted to chemical proportions to distinguish illicit and benign organic materials. An extensive set of conversion factors based on Monte Carlo numerical simulations has been calculated, taking into account neutron slowing down and photon attenuation in the cargo materials. An experimental validation of the method is presented by comparing the measured chemical fractions of known materials, in the form of bare samples or hidden in a cargo container, to their real chemical composition. Examples of application to real cargo containers are also reported, as well as simulated data with explosives and illicit drugs.
associated particle technique; explosives and illicit drugs detection; fast neutron interrogation; material identification; neutron moderation and photon attenuation in cargo containers
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
654 (1)
2011.
621-629
objavljeno
0168-9002
10.1016/j.nima.2011.05.076