Abstract
Radiation damage of CaF 2, SrF 2 and BaF 2 crystals after thermal treatments in air at high temperatures (above 700°C) has been studied and compared with that of “as grown” samples. An enhancement of the V k -centres' production efficiency was found in the three compounds under LNT X-irradition. Interstitial atomic hydrogen (H o i) and OH −-interstitial fluorine complexes were also found in SrF 2, and BaF 2 but not in CaF 2, irradiated at LNT. RT irradiation produces H o i in CaF 2 and H o i, OH −-interstitial complexes and substitutional hydrogen ions (H − s) in SrF 2 and BaF 2. A different behaviour of the EPR signal of the H o i centres created at RT and LNT was observed at increased microwave power.
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