Radiation-defect formation in large crystals was considered. It was shown that F-centers were efficiently formed in crystals that were doped with CO32− and OH−. It was noted that Na ions hardened the crystals against the radio-chemical reaction of F-centers, and HCO3- formation.

Role of Sodium in Radiation Defect Formation in CsI Crystals. L.N.Trefilova, A.M.Kudin, L.V.Kovaleva, T.A.Charkina, A.I.Mitichkin, L.E.Belenko: Radiation Measurements, 2001, 33[5], 687-92