Performance of a monolithic LaBr3:Ce crystal coupled to an array of silicon photomultipliers

作者：Ulyanov Alexei^*; Morris Oran; Hanlon Lorraine; McBreen Sheila; Foley Suzanne; Roberts Oliver J; Tobin Isaac; Murphy David; Wade Colin; Nelms Nick; Shortt Brian; Slavicek Tomas; Granja Carlos; Solar Michael

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2016, 810: 107-119.

DOI：10.1016/j.nima.2015.11.148

• Gamma-ray detector
• Scintillator
• LaBr3
• Lanthanum bromide
• SiPM
• Silicon photomultiplier

A gamma-ray detector composed of a single 28 x 28 x 20 mm(3) LaBr3:Ce crystal coupled to a custom built 4 x 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 FVVHM 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.

• 出版日期2016-2-21