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LaBr3:Ce crystals, with photomultiplier or single SiPM readout (up to 3x3mm$^2$) have been introduced for radiation imaging in medical physics. An R&Dwas pursued with 1/2" and 1" LaBr3:Ce crystals, from different producers, torealize compact large area detectors (up to some cm $^2$ area) with SiPM arrayreadout, aiming at high light yields, good energy resolution,good detectorlinearity and fast time response for low-energy X-rays. The study was triggeredby the FAMU experiment at the RIKEN-RAL muon facility, aiming at a precisemeasurement of the proton Zemach radius to solve the so-called "proton radiuspuzzle". The goal is the detection of characteristic X-rays around 130 KeV.Other applications may be foreseen for homeland security and $\gamma$-rayastronomy. Results were obtained with a direct readout based on a CAEN V1730FADC, with no need for an amplification stage. At the Cs$^{137}$ peak, energyresolutions up to $\sim 3 \%$ were obtained, using a readout with HamamatsuSiPM arrays. These results compare well with best available results obtainedwith a PMT readout.

Detection of low-energy X-rays with 1/2 and 1 inch LaBr3:Ce crystals read by SIPM arrays