Universiti Teknologi Malaysia Institutional Repository

Photon signature analysis using template matching

Bradley, D. A. and Hashim, Suhairul and Saripan, M. I. and Wells, K. and Dunn, W. L. (2011) Photon signature analysis using template matching. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 652 (1). pp. 466-469. ISSN 0168-9002

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Official URL: http://dx.doi.org/10.1016/j.nima.2011.01.142

Abstract

We describe an approach to detect improvised explosive devices (IEDs) by using a template matching procedure. This approach relies on the signature due to backstreaming ? photons from various targets. In this work we have simulated cylindrical targets of aluminum, iron, copper, water and ammonium nitrate (nitrogen-rich fertilizer). We simulate 3.5 MeV source photons distributed on a plane inside a shielded area using Monte Carlo N-Particle (MCNP TM) code version 5 (V5). The 3.5 MeV source gamma rays yield 511 keV peaks due to pair production and scattered gamma rays. In this work, we simulate capture of those photons that backstream, after impinging on the target element, toward a NaI detector. The captured backstreamed photons are expected to produce a unique spectrum that will become part of a simple signal processing recognition system based on the template matching method. Different elements were simulated using different sets of random numbers in the Monte Carlo simulation. To date, the sum of absolute differences (SAD) method has been used to match the template. In the examples investigated, template matching was found to detect all elements correctly.

Item Type:Article
Uncontrolled Keywords:backstreamed photons, improvised explosive device, monte carlo N-particle (MCNP), template matching
Subjects:Q Science
Divisions:Science
ID Code:29572
Deposited By: Yanti Mohd Shah
Deposited On:18 Mar 2013 16:15
Last Modified:25 Apr 2019 09:18

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