Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8168232 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2016 | 10 Pages |
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/h at 1 m and neutron emission rate of 1.5Ã107 per second into 4Ï and a maximum acquisition time of 2 h, to characterize two 100Ã100Ã100 mm3 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
Malcolm J. Joyce, Stewart Agar, Michael D. Aspinall, Jonathan S. Beaumont, Edmund Colley, Miriam Colling, Joseph Dykes, Phoevos Kardasopoulos, Katie Mitton,