Jh. Fisher et al., SPECTROSCOPIC ANALYSIS OF PROTON-INDUCED FLUORESCENCE FROM CERIUM-DOPED YTTRIUM-ALUMINUM-GARNET, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 80-1, 1993, pp. 1207-1209
We have determined the effect of proton induced damage on relative sci
ntillation efficiency for yttrium aluminum garnet doped with cerium (Y
AG: Ce). The YAG: Ce phosphor samples were exposed to a 3 MeV proton b
eam, and substrate temperature was limited to control heating damage.
Real time in situ measurements of the fluorescence spectra permitted o
bservation of the spectral characteristics of scintillator deteriorati
on due to particle induced damage. Fluorescence from YAG: Ce is relati
vely dim when compared to other rare earth oxysulfide compounds and th
e light intensity drops rapidly with dose. Spectra from proton irradia
ted YAG: Ce exhibit a broad fluorescence peak that is much wider than
is typical in other yttrium and gadolinium phosphor compounds. The phy
sical processes in YAG:Ce are very different from other bright-line ph
osphors as shown by the large difference in the observed fluorescence
peak width. Light intensity decreases with dose, following the Birks a
nd Black empirical model.