UV effect on the cathodo- and thermoluminescence properties of a gem-quality Cr-rich diaspore (alpha-AlOOH)


TOPAKSU M. , Correcher V., Boronat C., Garcia-Guinea J., Portakal Z. G. , AKÇA S.

APPLIED RADIATION AND ISOTOPES, cilt.141, ss.101-106, 2018 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 141
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.apradiso.2018.08.025
  • Dergi Adı: APPLIED RADIATION AND ISOTOPES
  • Sayfa Sayıları: ss.101-106

Özet

This work reports on the cathodoluminescence (CL) and thermoluminescence (TL) properties of gem-quality diaspore samples from Milas/Mugla (Turkey) after 100 h of ultraviolet-C (UVC) exposure. The UVC exposure induces significant changes in the intensity of the CL emission in the range of 400-800 nm that would be mainly associated with photo-oxidation processes of the impurities (Cr3+, Ti3+, Fe2+) that substitute for Al3+ in the diaspore (alpha-AlOOH) lattice. The UVC effect on the 400 nm-TL behavior of beta irradiated samples in the range of 0.1-8 Gy modifies the TL glow curves probably due to both photo-transfer process where electrons release from deeper to shallower traps and redox reactions involving, also, breakages-linkages of chemical bonds. Meanwhile, the 'as received' samples consist of three maxima centered at about 120, 180, and 234 degrees C, the 100 h UVC-irradiated samples display three maxima at 122, 220 and 270 degrees C. The physical trapping parameters (intensity and peak position, trap depth and pre-exponential factor) for each TL curve were estimated by using a computerized glow curve analysis program.