Randall, G;
Ellis, M;
Duroe, K;
Jones, A;
Joyce, M;
Payne, C;
Sellin, P;
(2016)
RadICAL stack: A localisation method for dynamic gamma/neutron fields.
In:
2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) [Proceedings].
(pp. pp. 684-687).
Institute of Electrical and Electronics Engineers (IEEE)
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Abstract
A variation of the RadICAL (Radiation Imaging Cylinder Activity Locator) system capable of operating in a dynamic environment, such as that created by active interrogation techniques, has been developed. RadICAL is a novel method for locating a radiological source using a rotating detector element. The detector geometry is that of a thin sheet and is rotated to present a constantly changing surface area to the source; it therefore generates a characteristic temporal response which can be used to determine the source direction. The time required to determine the direction of a source make it unsuitable for dynamic environments and so an alternative method is presented that uses a stack of identical scintillator slabs positioned at fixed horizontal angles around a central axis. By comparing count rates from each slab to a standard response curve, using a specially developed algorithm, the direction of a source can be determined without the need to rotate the detector. EJ-299-33 plastic scintillator was used to allow detection of separate neutron and gamma events in a mixed field through pulse shape discrimination. A four element detector was built and shown to achieve a positional accuracy of approximately 4.4 degrees when exposed to a 1.44MBq 137 Cs source at distances of up to 2m. The same detector was used to discriminate separate neutron and gamma events in a mixed field, which allows for the possibility of locating a neutron source within a gamma rich environment.
| Type: | Proceedings paper |
|---|---|
| Title: | RadICAL stack: A localisation method for dynamic gamma/neutron fields |
| Event: | 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 31 October - 7 November 2015, San Diego, California, USA |
| ISBN-13: | 9781467398626 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/NSSMIC.2015.7581900 |
| Publisher version: | http://dx.doi.org/10.1109/NSSMIC.2015.7581900 |
| Language: | English |
| Additional information: | Copyright © 2015 by the Institute of Electrical and Electronics Engineers, Inc (IEEE). All Rights Reserved. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. |
| Keywords: | Detectors, Neutrons, Shape, Slabs, Standards, Photonics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1529607 |
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