| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 673329 | Thermochimica Acta | 2014 | 5 Pages |
•Thermoluminescence of X-ray irradiate biotite was studied at various heating rates.•Thermal quenching was found to decrease with increase in annealing temperature.•Due to annealing one trap level was vanished and a new shallow trap level generated.•The new trap level contributes low thermally quenched thermoluminescence signal.
Thermoluminescence (TL) of X-ray irradiated natural biotite annealed at 473, 573, 673 and 773 K were studied within 290–480 K at various linear heating rates (2, 4, 6, 8 and 10 K/s). A Computerized Glow Curve Deconvolution technique was used to study various TL parameters. Thermal quenching was found to be very high for un-annealed sample, however it decreased significantly with increase in annealing temperature. For un-annealed sample thermal quenching activation energy (W) and pre-exponential frequency factor (C) were found to be W = (2.71 ± 0.05) eV and C = (2.38 ± 0.05) × 1012 s−1 respectively. However for 773 K annealed sample, these parameters were found to be W = (0.63 ± 0.03) eV, C = (1.75 ± 0.27) × 1014 s−1. Due to annealing, the initially present trap level at depth 1.04 eV was vanished and a new shallow trap state was generated at depth of 0.78 eV which contributes very low thermally quenched TL signal.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
