An advanced dynamic neutron imaging system has been constructed in the McMaster Nuclear Reactor (MNR) for nondestructive testing and multi-phase flow studies in energy and environmental applications. A high quality neutron beam is required with a thermal neutron flux greater than 5.0×106 n/cm2-s and a collimation ratio of 120 at image plane to promote high-speed neutron imaging up to 2000 frames per second. Neutron source strength and neutron transport have been experimentally and numerically investigated. Neutron source strength at the beam tube entrance was evaluated experimentally by measuring the thermal and fast neutron fluxes, and simple analytical neutron transport calculations were performed based upon these measured neutron fluxes to predict facility components in accordance with high-speed dynamic neutron imaging and operation safety requirements. Monte-Carlo simulations (using MCNP-4B code) with multiple neutron energy groups have also been used to validate neutron beam parameters and to ensure shielding capabilities of facility shutter and cave walls. Neutron flux distributions at the image plane and the neutron beam characteristics were experimentally measured by irradiating a two-dimensional array of Copper foils and using a real-time neutron radiography system. The neutron image characteristics — such as neutron flux, image size, beam quality — measured experimentally and predicted numerically for beam tube, beam shutter and radiography cave are compared and discussed in detail in this paper. The experimental results show that thermal neutron flux at image plane is nearly uniform over an imaging area of 20.0-cm diameter and its magnitude ranges from 8.0×106 – 1.0×107 n/cm2-sec while the neutron-to-gamma ratio is 6.0×105 n/cm2-μSv.
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14th International Conference on Nuclear Engineering
July 17–20, 2006
Miami, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4244-4
PROCEEDINGS PAPER
Neutron Transport Characteristics of a Nuclear Reactor Based Dynamic Neutron Imaging System Available to Purchase
Anas M. Khaial,
Anas M. Khaial
McMaster University, Hamilton, ON, Canada
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Glenn D. Harvel,
Glenn D. Harvel
McMaster University, Hamilton, ON, Canada
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Jen-Shih Chang
Jen-Shih Chang
McMaster University, Hamilton, ON, Canada
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Anas M. Khaial
McMaster University, Hamilton, ON, Canada
Glenn D. Harvel
McMaster University, Hamilton, ON, Canada
Jen-Shih Chang
McMaster University, Hamilton, ON, Canada
Paper No:
ICONE14-89504, pp. 409-417; 9 pages
Published Online:
September 17, 2008
Citation
Khaial, AM, Harvel, GD, & Chang, J. "Neutron Transport Characteristics of a Nuclear Reactor Based Dynamic Neutron Imaging System." Proceedings of the 14th International Conference on Nuclear Engineering. Volume 3: Structural Integrity; Nuclear Engineering Advances; Next Generation Systems; Near Term Deployment and Promotion of Nuclear Energy. Miami, Florida, USA. July 17–20, 2006. pp. 409-417. ASME. https://doi.org/10.1115/ICONE14-89504
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