Characteristics of phosphor used for beam monitoring: Intensity growth of scintillation and long-lived residual emission observed on steady state γ-radiolysis

The visible scintillation around 690 nm from Desmarquest AF995R, which is used for real-time beam monitoring, was investigated on steady state γ-radiolysis at room and low temperatures. The temperature dependence of the scintillation intensity indicates the existence of more than two processes with different activation energies. The newly found growth of the scintillation which continues for over several hours on continuous irradiation shows saturating behavior. Weak residual emissions remaining for over a day after stopping the irradiation were also observed.