Radiation Damage in CaF2 and BaF2 Investigated by the Channeling Technique

The radiation damage in single crystals of CaF2 and BaF2 due to room temperature bombardment with 2.0 MeV helium ions has been studied by the channeling technique. Backscattering spectra for the 111 and 110 axial directions were taken after different doses of random irradiation. A slight increase of the aligned yield with radiation dose has been found for both crystals at doses below 1017 ions/cm2. For CaF2 at a dose of about 1.4 × 1017 ions/cm2 a steep increase is found, after which the aligned yield saturates at a high value. Analyses of spectra measured along different aligned directions indicate that the structures of defects in CaF2 and BaF2 differ.

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