Radiation Damage of Rare Earth Ions Doped Barium Fluoride Crystals

The radiation resistance of rare earth doped barium fluoride (BaF2) crystals was investigated. Stable trivalence elements, such as Y, La and Lu, have no effect on radiation resistance. While the elements which changes its valence from +3 to +4 under irradiation, such as Ce and Pr, are harmful to the radiation resistance of BaF2, the elements which changes its valence from + 3 to +2 under irradiation, such as Sm, Eu, Dy and Yb, are useful in eliminating color centers in visible range, but may introduce some additional color centers in UV range.