# Calculation of the Half‐Life for the TL Signal of BeO Under Gamma and Alfa/Gamma Irradiation

## TL;DR

This study examines how BeO's thermoluminescent signal decays under different types of radiation, revealing important insights for dosimetry applications.

## Contribution

The paper provides new half-life data for BeO's thermoluminescent components under gamma and alpha/gamma irradiation.

## Key findings

- BeO's TL glow curves show three main peaks with distinct activation energies and kinetic orders.
- Half-lives of the TL components vary significantly between gamma and alpha/gamma irradiation.
- The 477 K peak shows a linear dose response and different stability trends under irradiation.

## Abstract

The thermoluminescent (TL) properties of BeO ceramics (Thermalox 995) were investigated under gamma and alpha/gamma irradiation. Glow curves in both cases exhibit three main peaks at 348 ± 1 K, 477 ± 2 K, and 616 ± 1 K. Activation energies for gammainduced peaks are 0.76 ± 0.03 eV, 1.18 ± 0.04 eV, and 1.11 ± 0.02 eV; these increase slightly under alpha/gamma irradiation to 0.81 ± 0.02 eV, 1.22 ± 0.03 eV, and 1.18 ± 0.01 eV. The kinetic orders are close to first order, with slightly higher values observed for the 477 K peak. Based on these parameters, the half‐lives of the TL components were calculated. For gamma: 131 s, 1.92 years, and 522 years; and for alpha/gamma: 168 s, 5.07 years, and 2067 years. Fading experiments on five samples showed deviations of less than 10% from theoretical values for the first peak. The half‐life also varied with irradiation time: the 477 K peak showed a decreasing trend, while the 616 K peak increased, indicating differences in trap‐filling mechanisms. Deconvolution analysis revealed that the second peak (around 477 K) exhibits the most linear dose response under both irradiation types. These results underscore the significance of analyzing half‐life behavior to understand the stability and performance of BeO as a dosimetric material under varied irradiation conditions.

Thermoluminescent glow peaks in BeO Thermalox 995 exhibit irradiation‐type‐dependent half‐lives and activation energies, suggesting a complex dynamic trap behavior. The 478 K peak shows a linear dose response and distinct stability trends, emphasizing the importance of half‐life analysis in dosimetric applications under gamma and alpha/gamma irradiation.