| Abstract: | The absorption spectra of undoped Y2SiO5 crystals were studied before and after γ‐irradiation. After γ‐irradiation, the additional absorption peaks at 260‐270 and 320nm were observed in as‐grown and H2‐annealed Y2SiO5 crystal, but it did not occur in air‐annealed Y2SiO5 crystal. These absorption peaks were attributed to F color centers and O– hole centers, respectively. Owing to more oxygen vacancies and color centers in H2‐annealed Y2SiO5 crystal than that in as‐grown Y2SiO5 crystal after γ‐irradiation, the additional absorption peaks were more intense in the former than that in the latter. With the irradiation dose increasing from 20 to 220kGy, the intensity of additional absorption peaks increased. © 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
