Light yield non-proportionality of undoped YAP scintillator

Scintillation properties of undoped YAP crystal were studied. The emission spectra show a very intense light component at 360 nm. Analysis of the light pulse shape resulted in five components, four of them, with time constants of 38±2 ns, 92±3 ns, 7.5±0.5 μs and 24±3 μs, representing high light intensity. The light yield was found to be temperature dependent, N ph = 3090±130 ph/MeV at liquid nitrogen temperature and N ph = 1440±60 ph/MeV at room temperature. Also the light yield non-proportionality shows temperature dependence and is more pronounced at room temperature.