Gamma ray induced radiation damage in ∅1in×1inLaBr3:5%CeLaBr3:5%Ce

The consequences of irradiating ∅1in×1inLaBr3:5%CeLaBr3:5%Ce crystals with 0.1–100 kGy gamma radiation have been investigated. The material displays lower photoelectron yield and poorer energy resolution after exposure to a 60Co source. The magnitude of the damage is larger in a packed scintillator. In addition to a prompt effect following gamma irradiation, consisting of a deterioration in both photoelectron yield and energy resolution, there is a delayed effect over a timescale of several days, resulting in a further decrease of yield, but accompanied by a partial recovery of resolution.