Enhanced Efficiency of pbwo4:Mo, Nb Scintillator

The influence of Nb codoping is studied in PbWO4:Mo scintillator. The measurements of radioluminescence, thermoluminescence, scintillation decay and light yield show that steady-state radioluminescence efficiency of PbWO4:Mo,Nb scintillator with the optimised doping concentrations becomes comparable with BGO. However, slow components in the decay appear down to several tens of microseconds, which results in LY increase of about factor 3 only compared to an undoped PbWO4. The existence of slow decay components may be related to relatively intense thermoluminescence peak round 230 K.