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Photon-induced positron annihilation for standoff bomb detection

Bradley, D. A. and Hashim, S. and Cabello, J. and Wells, K. and Dunn, W. L. (2010) Photon-induced positron annihilation for standoff bomb detection. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 619 (1-3). pp. 415-418. ISSN 01689002

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Official URL: http://dx.doi.org/10.1016/j.nima.2009.10.073


We describe an approach to detect improvised explosive devices (IEDs) by using photon-induced positron annihilation radiation (PIPAR). This system relies on back-scattered ? photons from the target and surrounding objects following exposure to high energy X-rays from a betatron. In this work we simulate the use of Bremsstrahlung source operating at 3.5 MeV, with a scintillation detector, working in PIPAR mode, in order to reduce noise produced by undesired back-scattering from the surrounding objects. In this paper, we describe the basic imaging method and preliminary results on simulating a suitable betatron source. Two types of X-ray filters copper (Cu) and aluminium (Al), have been used in the simulation to observe their differences in the deposited energy spectrum in the iron target. It was found that the use of iron target in conjunction with 2 mm Al filter is capable of detecting annihilation ? photons. An initiated experiment with an interlaced source also shows promise.

Item Type:Article
Uncontrolled Keywords:improvised explosive device, standoff detection, annihilation radiation and backscatter
Subjects:Q Science > QC Physics
ID Code:13725
Deposited By: Siti Khairiyah Nordin
Deposited On:12 Aug 2011 02:10
Last Modified:12 Aug 2011 02:10

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