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We compared the performance of a SiPM array and a PMT in a laboratory settingusing a single 5.08x5.08-cm cylindrical sodium iodide scintillating crystal.Photomultiplier tubes (PMTs) are the most commonly used device to monitorscintillating materials for radiation detection purposes. The systems aresometimes limited by disadvantages in the PMTs that may degrade theirperformance, including temperature dependence and variation with magneticfield. Instrumentation engineering must also contend with a potentially largevolume relative to the active scintillator volume, fragility, and high voltagerequirements. One possible alternative is an array of silicon photomultipliers(SiPMs). Measurements were made with a 5.04x5.04-cm sensL J-series SiPM arrayand a 7.62cm Hamamatsu PMT. We demonstrated how the SiPM bias can besufficiently altered to remove the effects of temperature variation encounteredin environments where nuclear safeguards work is often performed. Finally, weevaluated a method of determining enrichment levels of ${}^{235}U$ at variouslevels and shielding configurations, using both the PMT-mounted andSiPM-mounted scintillator.

Replacement of a Photomultiplier Tube with Silicon Photomultipliers for use in Safeguards Applications