Abstract
CaF2–P2O5–B2O3 glasses mixed with 0.2mol% of MnO were prepared. The prepared samples were exposed to γ-rays for dose rate of 1.5kGy/h for two hours and their EPR spectra were recorded in the temperature range 300–475K. The spectra of pure as well as MnO doped glass samples exhibited a new and nearly axially symmetric (g⊥=2.0085 and g||=2.0090, A⊥= 34G and A||= 52G) signal with doublet hyperfine structure. The signal is attributed to PO42- radical formed by trapped hole on non-bonding orbital of oxygen. The analysis of these data together with thermoluminescence (TL) studies indicated that PO42- radical plays a crucial role in TL emission.
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