Author/Authors :
Chowdhury، نويسنده , , M.A.H and Holmes-Siedle، نويسنده , , K. McKemey، نويسنده , , A.K and Watts، نويسنده , , S.J and Imrie، نويسنده , , D.C، نويسنده ,
Abstract :
Colorations induced by Co-60 γ-irradiation have been studied in six 2.54 cm thick CsI(Tl) samples cut from three crystal boules grown in an experiment on the control of impurities. The growth of a “sextet” structure of bands on the high-energy side of the F-band was observed in all the samples as doses of γ-rays were increased. It is speculated that the sextet bands may be related to the excited states of the F centre. It is found that high concentrations of thallium in CsI(Tl) always reduce tolerance to radiation.
Keywords :
CsI(Tl) crystals , Radiation damage , Scintillation loss , colour centres , F-centre , L-centre
