title: Deconvolution of gamma-ray spectra obtained with NAI(Tl) detector in a water tank.
abstract: Maximum-likelihood fitting by the expectation maximization 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 (137)Cs.
authors.affiliation: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
authors.forename: M Sohelur
authors.initials: MS
authors.lastname: Rahman
authors.forename: Gyuseong
authors.initials: G
authors.lastname: Cho
authors.forename: Bo-Sun
authors.initials: BS
authors.lastname: Kang
mesh_terms: D000465:Algorithms; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D012974:Sodium Iodide / Q000528:radiation effects*; D013051:Spectrometry, Gamma / Q000379:methods*; D014867:Water / Q000032:analysis* / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D012974:Sodium Iodide