Environmental studies on X- and γ-irradiated LiCsSO4 crystals

Thermoluminescence (TL) characteristics of LiCsSO4 crystal have been studied after exposure to different doses of X and γ radiations. The glow curves showed TL response of three peaks at 75°C, 125°C and 250°C. The structure of the glow peaks due to X-rays is quite different from that due to γ-rays. UV exposure yields a regeneration of the TL peaks for the post-irradiated samples with X- or γ-radiation with some changes in the peak structure especially the third peak. For the post-X-ray irradiated crystals, the area under the third glow peak (PK III) increased linearly with the integrated time of UV exposure till about 30 min after which no changes were observed; while, for the post-γ-irradiated crystals, two linear regions were observed. The models of the TL response for the post-irradiated samples as a result of exposure to UV are discussed.