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Performance of a monolithic LaBr3: Ce crystal coupled to an array of silicon photomultipliers
School of Physics, University College Dublin, Ireland.
School of Physics, University College Dublin, Ireland; Galway-Mayo Institute of Technology, Galway, Ireland.
School of Physics, University College Dublin, Ireland.
School of Physics, University College Dublin, Ireland.
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2016 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 810, no 810, p. 107-119Article in journal (Refereed) Published
Abstract [en]

A gamma-ray detector composed of a single 28×28×20 mm3 LaBr3:Ce crystal coupled to a custom built 4×4 array of silicon photomultipliers was tested over an energy range of 30 keV to 9.3 MeV. The silicon photomultipliers were initially calibrated using 20 ns light pulses generated by a light emitting diode. The photodetector responses measured as a function of the number of incident photons were found to be non-linear and consistent with model predictions. Using corrections for the non-linearity of the silicon photomultipliers, the detector showed a linear response to gamma-rays with energies from 100 keV to the maximum available energy of 9.3 MeV. The energy resolution was found to be 4% FWHM at 662 keV. Despite the large thickness of the scintillator (20 mm) and a 5 mm thick optical window, the detector was capable of measuring the positions of the gamma-ray interaction points. The position resolution was measured at 356 keV and was found to be 8 mm FWHM in the detector plane and 11 mm FWHM for the depth of interaction. The detector can be used as a building block of a larger calorimeter system that is capable of measuring gamma-ray energies up to tens of MeV.

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2016. Vol. 810, no 810, p. 107-119
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URN: urn:nbn:se:miun:diva-33070DOI: 10.1016/j.nima.2015.11.148OAI: oai:DiVA.org:miun-33070DiVA, id: diva2:1190494
Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-03-16Bibliographically approved

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Slavicek, Tomas

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