Akademik Veri Yönetim Sistemi
JOURNAL OF LUMINESCENCE, cilt.214, 2019 (SCI-Expanded)
BeO ceramics have been used for quite a long time as radiation dosimeters besides being used in many other areas. BeO dosimeters can be stimulated both thermally and optically, giving rise to TL and OSL signals. BeO has two main dosimetric peaks, 2 and 3, by ignoring peak 1 that corresponds to a shallow trap, while the OSL curve is composed of two components, termed as C-1 and C-2. Irradiated BeO dosimeters showed ESR spectra at room temperature consisting of three centers I, II and III. These centers were assigned to Al+2 and O- centres; two different typical oxygen centre behaviours were monitored, one showing anisotropic and one isotropic properties. The present study attempted to perform correlation between the TL peaks 2 and 3, the CW-OSL components C-1 and C-2 and ESR centers I, II and III. The bleaching and decay features of the ESR centers are presented for the first time in the literature. The OSL component C-1 is correlated with the TL peak 2; both luminescence entities are associated with the ESR center I, attributed to the Al+2 center. Finally, thermal stability of center II suggests that it can be also tentatively correlated to both TL peak 2 and OSL component C-1. Moreover, the present study provides strong experimental arguments towards a correlation between TL peak 3, CW-OSL component C-2 and ESR center III, namely oxygen ion (isotropic). Intense transfer was monitored either (a) from deeper traps to both traps responsible for TL peaks 2 and 3, as well as (b) from the trap of TL peak 3 to that of TL peak 2. Nevertheless, reconstruction as well as indirect TA-OSL signal monitoring indicates that the transfer is more intense to the trap corresponding to TL trap 3. For this reason, even after depleting both TL peaks, intense OSL curves were still measured.