研究了γ-辐照前后纯Y2SiO5和Eu3+掺杂的Y2SiO5晶体吸收光谱的变化,辐照后,未退火和氢气退火的纯Y2SiO5晶体在260～270 nm和320 nm波段产生了附加吸收峰,分别是由F心和O-心的吸收引起的;经过空气退火的纯YSO晶体中,由于消除了氧空位,因此辐照后没有出现色心吸收峰。在Eu3+∶Y2SiO5晶体中,不但有相同的F心和O-心吸收峰,而且还有Eu2+离子在300 nm和390 nm的吸收峰。随着辐照剂量的增加,色心附加吸收峰增强。空气退火能减少Eu3+∶Y2SiO5晶体中的色心,而氢气退火能增加色心。

The absorption spectra of undoped and Eu3+-doped Y2SiO5 single crystals before and after gamma irradiation were studied. Additional absorption peaks at 260～270 nm and 320 nm were observed in irradiated Y2SiO5 crystal with no annealing or hydrogen-annealing, which were respectively caused by F centers and O- centers. Owing to the abserence of oxygen vacancy, there was no absorption peaks of color centers in air-annealed Y2SiO5 crystal. Additional absorption band of Eu2+ ions, which peaked at 300 nm and 390 nm, were produced in irradiated and H2-annealed Eu3+∶Y2SiO5 crystal, except absorption bands of F centers and O- centers. Additional absorption increased with irradiation dose increasing. Air-annealing could decrease the concentration of color centers, and the H2-annealing could increase it.