Interpretation of very high activation energies and frequency factors in TL as being due to competition between centres

R. Chen, A. Hag-Yahya

Research output: Contribution to journalArticlepeer-review

Abstract

Very high values, considered to be physically impossible, were reported for the activation energy E and the frequency factor s in some thermoluminescence (TL) peaks. In particular, peak 5 of LiF:Mg,Ti was reported to have E = 2.0 - 2.2 eV and s = 1020 - 1022 s-1. If a peak shape method or curve fitting of a TL peak is utilised, there is an inverse relation between the width and the activation energy. Thus, if for a given TL peak, competition causes a narrowing of the peak, the effective activation energy is larger than expected. This, in turn, will cause the effective s to be significantly larger than the original one. In this study a model of one trap and three centres is considered, and the relevant simultaneous differential equations solved. Concentrating on the second peak, which looks like a first order peak and is very narrow, results in E = 2.1 eV and s = 8 x 1020 s-1, for original parameters of E = 1.2 eV and s = 2.5 x 1011 s-1.

Original languageEnglish
Pages (from-to)17-20
Number of pages4
JournalRadiation Protection Dosimetry
Volume65
Issue number1-4
DOIs
StatePublished - 1996

Fingerprint

Dive into the research topics of 'Interpretation of very high activation energies and frequency factors in TL as being due to competition between centres'. Together they form a unique fingerprint.

Cite this