Real-time source localisation by passive, fast-neutron time-of-flight with organic scintillators for facility-installed applications

Astromskas, V. and Bradnam, S.C. and Packer, L.W. and Aspinall, M.D. and Joyce, M.J. (2021) Real-time source localisation by passive, fast-neutron time-of-flight with organic scintillators for facility-installed applications. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 994. ISSN 0168-9002

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Abstract

Fast neutron time-of-flight (ToF) has been used to characterise the location of a source of a mixed radiation field. Two EJ-309 organic scintillators and a fast, digital, data acquisition system have been used in a variety of positions to identify the location of a 252Cf neutron source inside a steel, water-filled tank. A methodology for extracting the distance between the neutron source and the neutron detector has been developed and verified with MCNP simulations. A reconstruction algorithm using the ToF data has been developed. The location of the neutron source has been estimated on this basis to be within 20 cm of its known location with a spatial resolution of ±7.8 cm. p-values extracted from the null test hypothesis have been estimated to be 0.975 and 0.996 for experimental and simulation data, respectively. By correctly identifying the location of the source, the potential for the system to discern between scattered and unscattered neutrons is demonstrated.

Item Type:
Journal Article
Journal or Publication Title:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
151836
Deposited By:
Deposited On:
19 Feb 2021 15:55
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Sep 2021 11:38