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arXiv · 1612.07631

Scintillation detectors constructed with an optimized 2x2 silicon photomultiplier array

Felix Liang·Hartmut Brands·Les Hoy·Jeff Preston·Jason Smith
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Abstract

Silicon photomultipliers (SiPMs) are a good alternative to photomultiplier tubes (PMTs) because their gain and quantum efficiency are comparable to PMTs. However, the largest single-chip SiPM is still less than 1~cm$^2$. In order to use SiPMs with scintillators that have reasonable sensitivity, it is necessary to use multiple SiPMs. In this work, scintillation detectors are constructed and tested with a custom 2x2 SiPM array. The layout of the SiPMs and the geometry of the scintillator were determined by performing Geant4 simulations. Cubic NaI, CsI, and CLYC with 18~mm sides have been tested. The output of the scintillation detectors are stabilized over the temperature range between --20 and 50~$^{\circ}$C by matching the gain of the SiPMs in the array. The energy resolution for these detectors has been measured as a function of temperature. Furthermore, neutron detection for the CLYC detector was studied in the same temperature range. Using pulse-shape discrimination, neutrons can be cleanly identified without contribution from $γ$-photons. As a result, these detectors are suitable for deploying in spectroscopic personal radiation detectors (SPRD).

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Felix Liang, Hartmut Brands, Les Hoy, Jeff Preston, Jason Smith. 2016-12-22. Scintillation detectors constructed with an optimized 2x2 silicon photomultiplier array. https://doi.org/10.1109/nssmic.2016.8069811

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