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以Ｘ射线荧光光谱分析为手段，测试了用Ｂｒｉｄｇｍａｎ方法生长的ＰｂＦ２：Ｇｄ晶体中Ｇｄ离子沿生长方向的分布．发现该晶体在Ｘ射线激发下的发光强度与Ｇｄ在ＰｂＦ２晶体中的含量变化均从结晶开始端至结晶结束端逐渐降低，表明ＰｂＦ２：Ｇｄ晶体的发光是不均匀的，这种不均匀性源于Ｇｄ离子在ＰｂＦ２晶体中的分布不均匀性．通过在ＰｂＦ２：Ｇｄ晶体中掺入一定量的碱金属离子，可以比较有效地改善Ｇｄ离子在ＰｂＦ２晶体中的不均匀分布，使晶体的发光均匀性和透光率得到明显提高，其中以Ｎａ离子的均匀化效果为最好．推测Ｎａ离子的作用是消除了ＰｂＦ２：Ｇｄ晶体中因Ｇｄ离子的掺杂而造成的间隙Ｆ离子，从而使晶体中的缺陷浓度大大降低．
The distribution of Gd ions in the growth direction of PbF2: Gd crystals grown by Bridgman method was tested by means of X-ray fluorescence spectroscopy. It was found that the luminescence intensity of the crystal under the X-ray excitation and the content of Gd in the PbF2 crystal decreased gradually from the beginning of the crystallization to the end of the crystallization, indicating that the luminescence of the PbF2: Gd crystal is inhomogeneous. Inhomogeneities in the distribution of Gd ions in PbF2 crystals. By doping PbF2: Gd into a certain amount of alkali metal ions, the uneven distribution of Gd ions in PbF2 crystals can be effectively improved, the luminescence uniformity and light transmittance of the crystals are obviously improved, and the Na ions The homogenization effect is the best. It is speculated that the role of Na ions is to eliminate interstitial F ions caused by the doping of Gd ions in the PbF2: Gd crystal, so that the defect concentration in the crystal is greatly reduced.