We present a SiPM-based gamma-ray detection module, which allows to read large LaBr 3 :Ce cylindrical crystals (diameter > 1'), typically adopted in nuclear physics experiments, with spectroscopic performances similar to those achievable with PMTs. High-Density SiPM technology for Near UltraViolet and blue light detection (NUV-HD, Fondazione Bruno Kessler, Italy) were used. These SiPMs show high Photo Detection Efficiency (PDE = 45% at 380 nm) and low Dark Count Rate (DCR < 100 kHz/mm 2 ). The photodetector prototype has a modular structure based on an array of 5 × 6 SiPMs, each one having an active area of 6 × 6 mm 2 and 30 μm microcells. This array was used for 1' scintillator readout and it was assembled in 2 × 2 planar format for the 2' scintillator readout. The spectroscopic measurements presented in this work were performed with 2' × 2' LaBr 3 :Ce irradiated with 57 C, 133 Ba, 137 Cs and 60 Co calibration sources. An energy resolution of 3.19 ± 0.01% was achieved at 662 keV with 2' LaBr 3 :Ce. The same crystal was tested with a Super Bialkali PMT (Hamamatsu R6233-100) showing a similar energy resolution of 3.07 ± 0.03% at 662 keV. Therefore, these results support the equivalence between SiPM and PMT for high-resolution spectroscopy.

A SiPM-Based Detection Module for 2' LaBr 3 :Ce Readout for Nuclear Physics Applications

Cozzi, Giulia;Buonanno, Luca;Busca, Paolo;Carminati, Marco;Fiorini, Carlo;Montagnani, Giovanni L.;Acerbi, Fabio;Gola, Alberto;
2017

Abstract

We present a SiPM-based gamma-ray detection module, which allows to read large LaBr 3 :Ce cylindrical crystals (diameter > 1'), typically adopted in nuclear physics experiments, with spectroscopic performances similar to those achievable with PMTs. High-Density SiPM technology for Near UltraViolet and blue light detection (NUV-HD, Fondazione Bruno Kessler, Italy) were used. These SiPMs show high Photo Detection Efficiency (PDE = 45% at 380 nm) and low Dark Count Rate (DCR < 100 kHz/mm 2 ). The photodetector prototype has a modular structure based on an array of 5 × 6 SiPMs, each one having an active area of 6 × 6 mm 2 and 30 μm microcells. This array was used for 1' scintillator readout and it was assembled in 2 × 2 planar format for the 2' scintillator readout. The spectroscopic measurements presented in this work were performed with 2' × 2' LaBr 3 :Ce irradiated with 57 C, 133 Ba, 137 Cs and 60 Co calibration sources. An energy resolution of 3.19 ± 0.01% was achieved at 662 keV with 2' LaBr 3 :Ce. The same crystal was tested with a Super Bialkali PMT (Hamamatsu R6233-100) showing a similar energy resolution of 3.07 ± 0.03% at 662 keV. Therefore, these results support the equivalence between SiPM and PMT for high-resolution spectroscopy.
2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings
9781538622827
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1077020
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