Spectral analysis of TL emission from pure and Eu‐doped NaCl crystals

Abstract

We have measured emission spectra during thermoluminescence of pure and europium-doped NaCl crystals following irradiation at ambient temperature with X-and γ-rays. Factors investigated include the effect of pre-irradiation annealing of crystals and the post-irradiation fading of colour centres. Results for other dopants such as chromium, strontium and nickel are considered. Glow curves show some degree of uniformity having common glow peaks for the impurities investigated. A low temperature glow peak near 60 °C emits predominantly high energy photons. A high temperature glow peak near 200 °C shows less consistency, varying both in temperature and in the energy of emitted photons. Samples doped with chromium and nickel impurities inhibit emission at certain wavelengths. Pre-annealing crystals before irradiation produce changes in emission wavelengths.

Common features of thermoluminescence in NaCl and LiF crystals

“…In Eu-doped NaCl crystals for example the F-band can decay to zero with an extended period of storage, yet a significant TL signal remains [2]. On the other hand, certain impurities in NaCl (e.g.…”