Thermoluminescence induced by gamma radiation in LiCsSO₄ ferroelastic crystal doped with different heavy metals

Abstract

Thermoluminescence (TL) glow curves of lithium cesium sulphate ferroelastic crystals LiCsSO₄ doped with 0.5% of Os, Tb, Eu and Tl have been studied in the temperature range from room temperature to 300°C. Three peaks are observed at about 75, 125 and 225°C. The study includes also analysis of peak position and peak height of the glow curves with various dopant ions at different gamma radiation doses. The results are interpreted on the basis of point defects introduced interstitially or substitutionally admixtured into the host lattice. In spite of the host material being the same (LiCsSO₄), the glow curve structure changes due to variation of dopant materials (Os, Tb, Eu, and Tl). The obtained results are discussed in detail. The applicability of such materials for accident dosimetry depends on the lower limit of dectection.

Key words:

• Thermoluminescence
• gamma-irradiation
• doped LiCsSO₄
• ferroelastic crystals