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Figure 3: (a) The energy windows used in triple-energy window method by the trapezoidal approximation for the second photopeak window (221–269 keV). (b) The estimation of scatter area of the second photopeak window by the triangular approximation along with the spectrum of true scatter counts into this energy window

Figure 3: (a) The energy windows used in triple-energy window method by the trapezoidal approximation for the second photopeak window (221–269 keV). (b) The estimation of scatter area of the second photopeak window by the triangular approximation along with the spectrum of true scatter counts into this energy window