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通过建立300keV～1.5Mev能区的γ射线的点源效率与源距离的拟合回归方程,解决了效率随源距离变化的修正问题,为某些特殊要求下快速测量速报数据提供理论支持.“,”It deals with the regression equation between radiation detection efficiency and distance for γ point source in 300keV～1.5MeV, founds the correct between radiation detection efficiency and distance,provides support for rapid survey expedited reporting in some Special occasions.