Abstract: αSPECTROMETRY WITH Si（Au）SURFACE BARRIER SEMICONDUCTOR DETECTOR FOR ISOTOPIC ABUNDANCE OF MICRO-AMOUNT URANIUMShi Zhixia;Lu Zhengyong;Li Yuanxin;Zhang Jingjuan（China Institute for Radiation Protection,P. O. Box 120,Taiyuan 030006)Abstract:αspectrometer equiped with Si（Au）surface barrier semiconductor detector made in China is used in an intercomparison of the analysis of mineral water organized by World Health Organization──International Reference Centre for Radioactivity（WHO IRC）in 1988．The items for comparison include the analysis of234U,235U and238U.Radioactivity levels of the above radionuclides range from 0．001 to 0．2Bq／l．The values reported in this paper are close to the IRC reference values or mean values.Keywords:αspectrometry Semiconductor detector Micro-amount uranium iso topic