Use of Silicon Photomultipliers in ZnS:6LiF scintillation neutron detectors: signal extraction in presence of high dark count rates

Abstract

We report on the possibility of using Silicon Photomultipliers (SiPMs)to detect the scintillation light from neutron conversion in ZnS:6LiF scintillators.The light is collected by wavelength-shifting fibers embedded into the scintillator.The difficulty of extracting neutron signals in the presence of high dark countrates of the SiPMs is addressed by applying a dedicated processing algorithm to analyzethe temporal distribution of the SiPM pulses.With a single-channel prototype detection unit we demonstrate a very goodneutron signal extraction at SiPM dark count rates of about 1 MHz.