Conversion factors from counts to chemical ratios for the EURITRACK tagged neutron inspection system

被引：24

作者：

El Kanawati, W. ^{[1
]}

Perot, B. ^{[1
]}

Carasco, C. ^{[1
]}

Eleon, C. ^{[1
]}

Valkovic, V. ^{[2
]}

Sudac, D. ^{[3
]}

Obhodas, J. ^{[3
]}

机构：

[1] CEA, DEN, Nucl Measurement Lab, F-13108 St Paul Les Durance, France

[2] ACTdoo, Zagreb 10000, Croatia

[3] Rudjer Boskovic Inst, Zagreb 10000, Croatia

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2011年 / 654卷 / 01期

关键词：

Associated particle technique; Fast neutron interrogation; Explosives and illicit drugs detection; Material identification; Neutron moderation and photon attenuation in cargo containers; CARGO CONTAINERS;

D O I：

10.1016/j.nima.2011.05.076

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The EURopean Illicit TRAfficking Countermeasures Kit (EURITRACK) uses 14 MeV neutrons produced by the (3)H(d,n)(4)H 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. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：621 / 629

页数：9

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