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Proceedings Paper

Detectors for the gamma-ray resonant absorption (GRA) method of explosives detection in cargo: a comparative study
Author(s): David Vartsky; Mark B Goldberg; Gideon Engler; Asher Shor; Aharon Goldschmidt; Gennady Feldman; Doron Bar; Itzhak Orion; Lucian Wielopolski
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Paper Abstract

Gamma-Ray Resonant Absorption (GRA) is an automatic-decision radiographic screening technique that combines high radiation penetration with very good sensitivity and specificity to nitrogenous explosives. The method is particularly well-suited to inspection of large, massive objects (since the resonant γ-ray probe is at 9.17 MeV) such as aviation and marine containers, heavy vehicles and railroad cars. Two kinds of γ-ray detectors have been employed to date in GRA systems: 1) Resonant-response nitrogen-rich liquid scintillators and 2) BGO detectors. This paper analyses and compares the response of these detector-types to the resonant radiation, in terms of single-pixel figures of merit. The latter are sensitive not only to detector response, but also to accelerator-beam quality, via the properties of the nuclear reaction that produces the resonant-γ-rays. Generally, resonant detectors give rise to much higher nitrogen-contrast sensitivity in the radiographic image than their non-resonant detector counterparts and furthermore, do not require proton beams of high energy-resolution. By comparison, the non-resonant detectors have higher γ-detection efficiency, but their contrast sensitivity is very sensitive to the quality of the accelerator beam. Implications of these detector/accelerator characteristics for eventual GRA field systems are discussed.

Paper Details

Date Published: 20 January 2004
PDF: 11 pages
Proc. SPIE 5198, Hard X-Ray and Gamma-Ray Detector Physics V, (20 January 2004); doi: 10.1117/12.508262
Show Author Affiliations
David Vartsky, Soreq Nuclear Research Ctr. (Israel)
Mark B Goldberg, Soreq Nuclear Research Ctr. (Israel)
Gideon Engler, Soreq Nuclear Research Ctr. (Israel)
Asher Shor, Soreq Nuclear Research Ctr. (Israel)
Aharon Goldschmidt, Soreq Nuclear Research Ctr. (Israel)
Gennady Feldman, Soreq Nuclear Research Ctr. (Israel)
Doron Bar, Soreq Nuclear Research Ctr. (Israel)
Itzhak Orion, Ben-Gurion Univ. of the Negev (Israel)
Lucian Wielopolski, Brookhaven National Lab. (United States)

Published in SPIE Proceedings Vol. 5198:
Hard X-Ray and Gamma-Ray Detector Physics V
Larry A. Franks; Arnold Burger; Ralph B. James; Paul L. Hink, Editor(s)

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