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Multichannel SiPM test readout system for gamma-ray measurements with monolithic inorganic CeBr_{3}

Veronika Asova, Galin Bistrev, Valentin Buchakchiev, Venelin Kozhuharov

TL;DR

The paper evaluates a SiPM-based multichannel readout for gamma-ray measurements using monolithic CeBr3 scintillators. By testing two crystal thicknesses with a 144-channel SiPM array and three radioisotopes, it characterizes energy resolution, detection efficiency, and linearity as a function of SiPM bias. The thicker CeBr3 crystal shows notably better energy resolution and higher relative efficiency than the thinner one, while the measured response exhibits slight nonlinearity and pedestal effects that warrant further study. The findings inform detector design trade-offs for high-rate gamma spectroscopy in fields such as nuclear medicine, environmental monitoring, and gamma-ray astronomy, and outline directions to address non-proportionality and calibration pedestal in future work.

Abstract

Energy resolution and the detection efficiency for gamma quanta are fundamental properties in the construction of detectors for ionizing radiation. In this study, a SiPM-based photodetector coupled to a monolithic inorganic CeBr_{3} crystal is exposed to gamma rays in order to study the performance of the CeBr_{3} crystal. Measurements are made using three different radioactive sources - ^{137}Cs, ^{22}Na, and ^{60}Co. For each source, the measurements are conducted at several SiPM bias voltages. Furthermore, two CeBr_{3} crystals with different thicknesses are used in order to study how detector efficiency is affected by crystal dimensions. A preliminary analysis of the data is presented.

Multichannel SiPM test readout system for gamma-ray measurements with monolithic inorganic CeBr_{3}

TL;DR

The paper evaluates a SiPM-based multichannel readout for gamma-ray measurements using monolithic CeBr3 scintillators. By testing two crystal thicknesses with a 144-channel SiPM array and three radioisotopes, it characterizes energy resolution, detection efficiency, and linearity as a function of SiPM bias. The thicker CeBr3 crystal shows notably better energy resolution and higher relative efficiency than the thinner one, while the measured response exhibits slight nonlinearity and pedestal effects that warrant further study. The findings inform detector design trade-offs for high-rate gamma spectroscopy in fields such as nuclear medicine, environmental monitoring, and gamma-ray astronomy, and outline directions to address non-proportionality and calibration pedestal in future work.

Abstract

Energy resolution and the detection efficiency for gamma quanta are fundamental properties in the construction of detectors for ionizing radiation. In this study, a SiPM-based photodetector coupled to a monolithic inorganic CeBr_{3} crystal is exposed to gamma rays in order to study the performance of the CeBr_{3} crystal. Measurements are made using three different radioactive sources - ^{137}Cs, ^{22}Na, and ^{60}Co. For each source, the measurements are conducted at several SiPM bias voltages. Furthermore, two CeBr_{3} crystals with different thicknesses are used in order to study how detector efficiency is affected by crystal dimensions. A preliminary analysis of the data is presented.

Paper Structure

This paper contains 5 sections, 8 equations, 8 figures.

Table of Contents

  1. Introduction
  2. Experimental setup
  3. Results
  4. Discussion
  5. Conclusions

Figures (8)

  • Figure 1: A schematic representation of the SiPM+Crystal setup.
  • Figure 2: Schematics of the experimental setup which are also shown in bib:nafski2022. The radioactive source is one of the three available ($^{137}$Cs, $^{22}$Na, $^{60}$Co).
  • Figure 3: The spectrum for $^{137}$Cs with 27.5 V SiPM bias voltage. Fit function is gaussian.
  • Figure 4: The spectrum for $^{137}$Cs with 29.0 V SiPM bias voltage. Fit function is gaussian.
  • Figure 5:
  • ...and 3 more figures