Abstract
This paper presents results of the development process of low-background, digital gamma-rays spectrometer equipped with Broad Energy Germanium detector (CANBERRA BE5030), multi-layer passive shield and cosmic veto system that consists of five plastic scintillators (SCIONIX EJ-200). Data acquisition is performed using digitizer CAEN DT5725 with CoMPASS software. Output data analysis is carried out with purposely written and developed code VETO. On the basis of conducted tests, acquisition parameters were set up and tuned as well as time delays between all detectors were established. As a result of the configuration process, the mean background counts reduction of 64% in the whole spectrum and 65% in annihilation peak were achieved. This procedure allowed diminishing detection limits of selected isotopes 37% on average.
Highlights
Gamma-ray spectrometry is one of the most versatile and commonly used nuclear radiation spectrometric technique
We present the construction and commissioning process of low-background, digital gamma-ray spectrometer with active shield and digital analyser as an acquisition and signal processing device
The results of the tuning process of following working parameters of digital filters implemented into digitizer: Trapezoid Rise Time, Ns Baseline and Ns peak are presented. Those parameters have, among others, crucial influence on final energy resolution of spectra obtained by Broad Energy Germanium (BEGe) detector
Summary
Gamma-ray spectrometry is one of the most versatile and commonly used nuclear radiation spectrometric technique. Keywords Low-background measurements · Low activity · Digital gamma-ray spectrometry · BEGe · Cosmic muons veto detector · Plastic scintillators
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