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|Title:||Thermostimulated luminescence (tsl) - thermal treatment in blue coloured calcite crystals|
|Keywords:||Thermal treatment;Calcite;Glow curve characteristics|
|IPC Code:||G01N 25/00|
|Abstract:||The thermostimulated luminescence (TSL) glow curve characteristics of ten blue coloured calcite crystals of Southern Tamil Nadu are analysed. The natural thermoluminescence (NTL) measurements were carried out for all the samples and annealed in air at the temperatures ranging from 200 to 700°C at an interval of 50°C. for 1 hr duration. The glow curves of annealed and unannealed samples irradiated with a gamma dose of 500 Gy show three peaks at 145, 255 and 345 °C, respectively, when recorded a with linear heating rate of 10°C/sec. Annealing treatment above 400°C increases the sensitivity of all TSL peaks except 345 °C. On the other hand, annealing at 700°C caused a collapse in the TSL sensitivity. The enhancement in TSL sensitivity was found to depend on the annealing temperature and time. Annealing treatment 600°C for 5 hr followed by quenching in air is the optimum conditions for TSL sensitisation and removal of RTL signal. The emission wavelength at 610 nm evidenced that the Mn2+ impurity is present in the samples which is responsible for luminescent emission.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.42(02) [February 2004]|
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