THE EFFECT OF HEATING RATE OF NANO-Α-ALUMINA ON THERMOLUMINESCENCE

Abstract

This research explores the fundamental thermoluminescence characteristics of irradiated nano-α-alumina particles, investigating their response to varying heating rates. The study involves recording TL luminescence curves, revealing a distinct peak with a maximum at approximately 202°C. As dose levels increase, the peak consistently shifts towards lower temperatures, indicating
adherence to non-first-order kinetics (b≠1). To examine the impact of the heating rate on the TL glow curve and derive kinetic parameters for nano α-Al2O3 with a particle size of 40 nm, specimens were exposed to a 6 kGy dose. Subsequently, TL glow curves were documented over a temperature range from room temperature to 300°C, employing different heating rates (2, 4, 6, 8, and
12°C/s). The peak temperature of the glow peak shifts towards higher temperatures as the heating rate increases, and the peak intensity continuously diminishes, aligning with TL theory. The observed decrease in TL glow peak intensity with escalating heating rates is attributed to thermal quenching, where quenching efficiency rises at higher temperatures. Normalizing maxi
mum TL intensities to the lowest heating rate (2°C/s) reveals a substantial 22% decrease in peak intensity.