Fast neutron tomography with real-time pulse-shape discrimination in organic scintillation detectors

Joyce, Malcolm John and Agar, Stewart and Aspinall, Michael and Beaumont, Jonathan and Colley, Edmund and Colling, Miriam and Dykes, Joseph Anttony and Kardasopoulos, Phoevos and Mitton, Katie (2016) Fast neutron tomography with real-time pulse-shape discrimination in organic scintillation detectors. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 834. pp. 36-45. ISSN 0168-9002

[img]
Preview
PDF (1-s2.0-S016890021630794X-main)
1_s2.0_S016890021630794X_main.pdf - Accepted Version
Available under License Creative Commons Attribution.

Download (1MB)

Abstract

A fast neutron tomography system based on the use of real-time pulse-shape discrimination in 7 organic liquid scintillation detectors is described. The system has been tested with a californium-252 source of dose rate 163 μSv/hr at 1 m and neutron emission rate of 1.5×107 per second into 4π and a maximum acquisition time of 2 hours, to characterize two 100 × 100 × 100 mm concrete samples. The first of these was a solid sample and the second has a vertical, cylindrical void. The experimental data, supported by simulations with both Monte Carlo methods and MATLAB ®, indicate that the presence of the internal cylindrical void, corners and inhomogeneities in the samples can be discerned. The potential for fast neutron assay of this type with the capability to probe hydrogenous features in large low-Z samples is discussed. Neutron tomography of bulk porous samples is achieved that combines effective penetration not possible with thermal neutrons in the absence of beam hardening.

Item Type:
Journal Article
Journal or Publication Title:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Information:
This is the author’s version of a work that was accepted for publication in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 834, 2016 DOI: 10.1016/j.nima.2016.07.044
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
80556
Deposited By:
Deposited On:
01 Aug 2016 10:02
Refereed?:
Yes
Published?:
Published
Last Modified:
02 Dec 2020 03:23