Stripping of the NaI (Tl) detector response function for continuous energy photon spectrum by SVD approach

Abstract

We have tried to obtain the spectrum of internal bremsstrahlung photons which are released simultaneously with beta particles and neutrinos from the Sr-90-Y-9(0) source in secular equilibrium. Detector parameters of the 5.08 cm x 5.08 cm NaI(Tl) detector are determined using standard calibration sources. A detector response function is generated for a single-energy gamma photon using detector parameters and Monte Carlo method. The Singular Value Decomposition (SVD) method is used for stripping of the detector response function effects from the raw experimental spectrum. The stripped experimental data are compared with KUB theory and a different stripping method that we used our former work on the same isotope. There is a much better agreement between experimental and theoretical findings comparing the former experimental data.