Pure BaF

2

crystal and La.Na.Ce doped BaF

2

crystals have been grown to improve the properties of BaF

2

crystal.UV transmission spectra

X-ray emission spectra

UV light excitation spectra

radiation hard property and energy spectrum of these crystals have been investigated.We found only 1% La deped BaF

2

crystal showed strong suppression on slow component and very slight reduction to fast component and 1% La doped BaF

2

crystal had the same radiation resistance as the pure BaF

2

in terms of its fast component light output when the radiation doses chauged from 10

5

rad to 10

6

rad.We first found 385nmnew excitation peak when La doped BaF

2

crystal was excited by UV light.