Gamma ray counting is often used to survey the distribution of active waste material in various locations. Ideally the output from such surveys would be a map of the activity of the waste. In this paper a simple matrix-inversion method is presented. This allows an array of gamma-count data to be converted to an array of source activities. For each survey area the response matrix is computed using the gamma-shielding code Microshield [1]. This matrix links the activity array to the count array. The activity array is then obtained via matrix inversion. The method was tested on artificially-created arrays of count-data onto which statistical noise had been added. The method was able to reproduce, quite faithfully, the original activity distribution used to generate the dataset. The method has been applied to a number of practical cases, including the distribution of activated objects in a hot cell and to activated nimonic springs amongst fuel-element debris in vaults at a nuclear plant.
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ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management
September 25–29, 2011
Reims, France
Conference Sponsors:
- Nuclear Engineering Division and Environmental Engineering Division
ISBN:
978-0-7918-5498-3
PROCEEDINGS PAPER
A Matrix-Inversion Method for Gamma-Source Mapping From Gamma-Count Data
Richard K. Bull,
Richard K. Bull
Nuvia Limited, Didcot, Oxon., UK
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Claire Burgess
Claire Burgess
Downing College, Cambridge University, Cambridge, UK
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Richard K. Bull
Nuvia Limited, Didcot, Oxon., UK
Ian Adsley
Nuvia Limited, Didcot, Oxon., UK
Claire Burgess
Downing College, Cambridge University, Cambridge, UK
Paper No:
ICEM2011-59082, pp. 531-537; 7 pages
Published Online:
August 17, 2012
Citation
Bull, RK, Adsley, I, & Burgess, C. "A Matrix-Inversion Method for Gamma-Source Mapping From Gamma-Count Data." Proceedings of the ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B. Reims, France. September 25–29, 2011. pp. 531-537. ASME. https://doi.org/10.1115/ICEM2011-59082
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