22-30 July 2021
North-West University
Africa/Johannesburg timezone
More Information Coming Soon

Influence of duration of annealing on thermoluminescence of natural quartz annealed at 1000 °C

Not scheduled
20m
Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Poster Presentation Track A - Physics of Condensed Matter and Materials Physics of Condensed Matter and Materials

Speaker

Damilola Folley (Rhodes University)

Description

The influence of duration of annealing on thermoluminescence of natural quartz annealed at 1000 °C is reported. The study looks at samples annealed for 10 and 60 minutes. A glow curve measured at 1 °Cs-1 after beta irradiation to 50 Gy for the sample annealed for 10 minutes shows seven peaks at 68, 130, 176, 276, 300, 360, and 416 °C labelled I through VII. The sample annealed for 1 hour has five peaks at 70, 128, 176, 234, and 308 °C labelled I-V respectively. A study of dosimetric features and kinetic analysis was carried out on the two prominent peaks, peak I and III for both samples. The peaks show a sublinear dose response for irradiation doses between 10 and 300 Gy. The electron trap responsible for peak I depletes faster at high duration annealing between irradiation and measurement. In contrast, the electron trap for peak III was more stable for both samples. Kinetic analysis shows that peak I is a first-order peak and peak III a non-first-order peak. The activation energy obtained using the initial rise, whole glow peak, and curve fitting methods is between 0.904±0.004 and 1.07±0.10 eV for peak I and between 1.10±0.01 and 1.23±0.01 eV for peak III. In particular, the kinetic parameters obtained for both peaks decrease with annealing time. This suggests that the duration of annealing at 1000 °C has an effect on the trap parameters of natural quartz.

Level for award;(Hons, MSc, PhD, N/A)?

N/A

Apply to be considered for a student ; award (Yes / No)?

No

Primary authors

Damilola Folley (Rhodes University) Makaiko Chithambo (Rhodes University)

Presentation Materials

Peer reviewing

Paper