A detailed study on Gd2SiO5scintillators: recovery from increased photon yield following irradiation

Increased light intensity and recovery of GSO scintillators following irradiation were studied by using accelerator beams of 290 MeV/n carbon nuclei. This is the first measurement of recovery phase by using accelerator beams. The obtained results were consistent with previous results obtained by using 60Co gamma rays and UV excitation. We confirmed a 23% increase in light intensity following irradiation with 7.4 kGy as well as exponential recovery on a time scale of 104s. The temporal profile of recovery was fitted by a single exponential with an asymptotic increase of 13±1% relative to the light intensity before irradiation. Active recovery was attempted by exposing an irradiated GSO sample to infrared light with intensity up to 8.3 kW/cm2, but no indication of accelerated recovery was observed.