A Comparison of Two Discrimination Spectrometers

Abstract

In order to obtain a neat gamma spectrum, two spectrometers were examined for thediscrimination of the low-energy part of the 137Cs gamma-ray spectrum which has electronicnoise. Pulse shape discrimination (PSD) time measurement (timing) method was used for thispurpose. This method, briefly, depends on the rise time measurement process of the signals.While implementing the process, a constant fraction discriminator (CFD) and a pulse shapeanalyzer (PSA) devices were used separately. Obtained spectra from the spectrometers werecompared with each other. To perform an exact comparison, partial and complete discriminationprocesses were realized. After the comparison, it was concluded that the discrimination processthrough the spectrometer with PSA device was more successful than that of the other one. Itwas suggested that the PSD method using the PSA device would give a clearer gammaspectrum when accumulating it by a NaI(Tl) scintillation detector.