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An organic glass scintillator developed by Sandia National Laboratories wascharacterized in terms of its light output and pulse shape discrimination (PSD)properties and compared to commercial liquid (EJ-309) and plastic (EJ-276)organic scintillators. The electron light output was determined throughrelative comparison of the $^{137}$Cs Compton edge location. The proton lightyield was measured using a double time-of-flight technique at the 88-InchCyclotron at Lawrence Berkeley National Laboratory. Using a tunablebroad-spectrum neutron source and an array of pulse-shape-discriminatingobservation scintillators, a continuous measurement of the proton light yieldwas performed for EJ-309 (200 keV$-$3.2 MeV), EJ-276 (170 keV$-$4.9 MeV), andthe organic glass (50 keV$-$20 MeV). Finally, the PSD properties of the organicglass, EJ-309, and EJ-276 were evaluated using an AmBe source and compared viaa figure-of-merit metric. The organic glass exhibited a higher electron lightoutput than both EJ-309 and EJ-276. Its proton light yield and PSD performancewere comparable to EJ-309 and superior to that of EJ-276. With theseperformance characteristics, the organic glass scintillator is well poised toreplace current state-of-the-art PSD-capable scintillators in a range of fastneutron detection applications.

Comparative scintillation performance of EJ-309, EJ-276, and a novel organic glass