锗酸铋晶体缺陷和小面生长

对坩埚下降法生长锗酸铋闪烁晶体的缺陷进行了研究，除使用通常研究透明晶体的光学方法，由于ＢＧＯ晶体在受到光辐照损伤对短波长光具有高的吸收系数，因此还采用近紫外光吸收形貌法研究晶体缺陷，以及缺陷与晶体小面之间的关系，并根据ＢＧＯ晶体的结晶习性和小面形成机理提出了减少和消除晶小面生长及缺陷的方法。

DEFECT AND GROWTH OF FACETS IN BISMUTH GERMANATE CRYSTAL

The defects of bismuth germanate crystal grown by Bridgman method were investigated.The optical characterization methods were used in the study of the defects of transparent crystal in visible light and the near UV absorption topography method is used in the study of the defects and relationship between defect and growth facets because scintillant BGO crystals, when suffered radiation damage,have a high absorption coefficient for light of short wavelength.On the basis of the crystal habit and the mechanism of growth facet of BGO,finally ways of reducing or eliminating the growth of crystal facets and defects are suggested.