Dosimeter properties of Ce and Eu doped LiCaAlF₆

Optical, scintillation properties, optical stimulated luminescence, and thermally stimulated luminescence of Ce 1, 3, and 5% doped and Eu 1, 1.5, and 2% doped LiCaAlF₆ crystals fabricated by Tokuyama Corp. were investigated. In transmittance, absorption was proportional to dopant concentrations and typical optical quantum yield of Ce and Eu-doped LiCaAlF₆ were 40 and 100%, respectively. Scintillation wavelength and decay time profiles were investigated under X-ray irradiation. Ce³⁺ and Eu²⁺ 5d-4f luminescence appeared around 300 nm and 370 nm with typical decay time of 40 ns and 1.5 ms, respectively. Optically stimulated luminescence of Ce-doped ones appeared under 405 nm stimulation with detectable intensity while those of Eu doped ones were quite weak. Thermally stimulated luminescence of Ce- and Eu-doped LiCaAlF₆ were enough strong and they exhibited good response function from 1 to 1000 mGy exposure.