Geant4 Simulation and Data Analysis of a Portable Plastic-Scintillator-Based Muon Tomography System

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Authors
  1. Moats, K.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN);Zernam Enterprises Inc., Ottawa ON (CAN)
Abstract
A portable muon tomography system could be used by the Canadian Armed Forces (CAF) to image suspect Special Nuclear Material (SNM) objects that are approximately 1 m³. The work in this report focuses on the simulation and laboratory studies of this system. The main challenge for image reconstruction in a portable muon tomography system is achieving a precise angular resolution. In order to do so, the optical yield of the scintillator detectors must be improved over that of the much larger CRIPT experiment. This work studied four optical couplers (Water, BC 630, EJ 500, and NOA 63) inserted between the plastic triangular scintillating bars and the wavelength shifting fibres of the portable system. In order to estimate the optical gain for each, the triggering mechanism was improved by considering an alternate geometry, dubbed the \Mega Triangle" configuration. Test data for this geometry revealed that the measured optical gain values are quite similar for each optical coupler. It was suggested that the presence of air bubbles when inserting the optical coupler could account for this behaviour and a series of trials using de-gassed optical couplers is underway. An optical simulation of this configuration was performed using the C++ Geant4 framework to confirm that the triggering was performing as expected. Once the optimal optical coupler and fibre diameter have been confirmed, they will be used in the simulation of four layers of four horizontal bars in order to determine how
Keywords
radiation detection;special nuclear material;tomography;muon;muon tomography;GEANT4;plastic scintillator;simulation;radiation transport
Report Number
DRDC-RDDC-2016-C287 — Contract Report
Date of publication
01 Sep 2016
Number of Pages
53
DSTKIM No
CA042822
CANDIS No
804717
Format(s):
Electronic Document(PDF)

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