LUMINESCENCE AND ELECTRO-CONDUCTANCE OF BAFBR-EU2-IRRADIATION AND PHOTOSTIMULATION( CRYSTALS DURING X)

In this work, luminescence and electroconductivity of single crystals of the X-ray storage phosphor, BaFBr:Eu2+, have been measured in situ and real time during X-irradiation and photostimulation. A difference in the time dependence between luminescence and electro-conductivity i s observed. It is also found that their temperature dependence is diff erent. It is concluded that the mechanism of photostimulated luminesce nce proposed by Takahashi et al. [1] and Iwabuchi et al. [8, 9], in wh ich during X-irradiation Eu2+ ions are ionized to Eu3+ ions and during photostimulation electrons of F centers are stimulated by visible lig ht to the conduction band, is questionable.