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Radiation Protection Dosimetry Advance Access originally published online on August 6, 2007
Radiation Protection Dosimetry 2008 128(3):289-293; doi:10.1093/rpd/ncm375
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Study of a gold-foil-based multisphere neutron spectrometer

Z. Wang1,3,*, J. D. Hutchinson1,4, N. E. Hertel1, E. Burgett1 and R. M. Howell2

1 Neely Nuclear Research Center, G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405, USA
2 Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA

* Corresponding author: zlwang{at}mdanderson.org

Received January 31, 2007, amended June 11, 2007, accepted June 15, 2007

Multisphere neutron spectrometers with active thermal neutron detectors cannot be used in high-intensity radiation fields due to pulse pile-up and dead-time effects. Thus, a multisphere spectrometer using a passive detection system, specifically gold foils, has been investigated in this work. The responses of a gold-foil-based Bonner sphere neutron spectrometer were studied for two different gold-foil holder designs; an aluminium-polyethylene holder and a polyethylene holder. The responses of the two designs were calculated for four incident neutron beam directions, namely, parallel, perpendicular and at ± 45° relative to the flat surface of the foil. It was found that the use of polyethylene holder resulted in a more isotropic response to neutrons for the four incident directions considered. The computed responses were verified by measuring the neutron spectrum of a 252Cf source with known strength.

3 Present address: Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, TX, USA

4 Present address: Los Alamos National Laboratory, Los Alamos, NM, USA


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