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Radiation Protection Dosimetry Advance Access originally published online on June 5, 2009
Radiation Protection Dosimetry 2009 135(3):203-210; doi:10.1093/rpd/ncp102
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Deconvolution of gamma-ray spectra obtained with NAI(Tl) detector in a water tank

M. Sohelur Rahman1, Gyuseong Cho1,* and Bo-Sun Kang2,*

1 Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
2 Department of Radiological Science, College of Health and Medical Science, Catholic University of Daegu, Gyeongsan, Gyeongbuk 712-702, South Korea

* Corresponding authors: gscho{at}kaist.ac.kr (G. C.), bskang{at}cu.ac.kr (B.-S. K.)

Received March 6, 2009, amended May 7, 2009, accepted May 11, 2009

Maximum-likelihood fitting by the expectation maximisation deconvolution method is presented to analyse gamma-ray spectra recorded using an NaI(Tl) detector for a water monitoring system. The applicability of the method was tested by deconvolving measured spectra taken using an industry standard 3'' x 3'' cylindrical NaI(Tl) detector in a model water tank with several calibration sources. The results show significant removal of the Compton continuum counts and efficient transfer of the counts into the corresponding photo-peaks. The peak-to-total count ratio and the number of counts in the photo-peaks in the deconvolved spectra increased approximately 4.67 and 5.29 times, respectively, compared with those of measured spectra taken using an NaI(Tl) scintillation detector in the case of 137Cs.


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