Beta ray induced optically stimulated luminescence properties of calcium oxide phosphor

This work presents the results on optically stimulated luminescence of calcium oxide (CaO). Polycrystalline CaO phosphors are irradiated with beta rays in the dose range 10 - 100 Gy. The optically stimulated luminescence (OSL) from CaO sample is strong, the decay is fast and entire signal decays within 50 s. OSL intensity increases linearly with beta dose. The life time and photo ionization cross section (PICS) of decay are in the range ~0.045, 1.5 and 41.391 s and 1.32x10^-16, 3.32x10^-18 and 1.42x10^-19 cm² for fast, medium and slow components, respectively. Further, the life time and PICS of fast, medium and slow LM-OSL components have been found to be 2.29, 6.0, 17.0 s and 2.56x10^-18, 9.77x10^-19, 3.45x10^-19 cm², respectively. Both the OSL curves exhibits general order kinetics. (author)