Scintillation photoelectron Nphels(E) and light LY(E) yields of YAP:Ce and YAG:Ce crystals

Abstract A newly developed hybrid photo-multiplier (HPMT) was used to measure scintillation photoelectron yield N phels ( E ) of well-known YAP:Ce and YAG:Ce scintillating crystals. N phels ( E ) measured by the HPMT or evaluated LY( E ) were compared with results obtained by the classical PMT. Generally, both crystals are characterized by roughly the same photoelectron and light yields which can reach up to 6400 phels/MeV or 24 000 ph/MeV, respectively. These yields were measured with cylindrical plates of shape ∅ 10 × 1 or 2 mm 3 under 662 keV γ-ray radiation. The energy resolutions of both crystals at 662 keV are good and the best values reach ≅4.6% or ≅5.1% for YAP:Ce or YAG:Ce, respectively.