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《Geochimica》 1982-03
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ALPHA-SPECTROMETRIC DETERMINATION OF URANIUM AND THORIUM IN GEOLOGICAL SAMPLES

Xia Ming Zhou Xiuyun(Institute of Geology, Academia Sinica) (Institute of Geochemistry, Academia Sinica)  
Alpha-spectrometric technique is described as an independent method of determining micro-content of U236 and Th232. This method is based on the comparison of U238 and Th232 alpha spectral activity in geological samples with U232 and Th223 spectral activity contributed by the spike of known concentration.The experiment procedure consists in dissolving fine powdered sample with acid and adding a given amount of U232_Th228 spike. The uranium and thorium are then separated by ion exchange. After purification each fraction is mounted on a separate stainless steel disk for measurement by alpha spectrometer which consist essentially of a surface barrier deterctor and a low noise amplification system connected to a multichannel analyser. After correcting for background, tail and other factors, the desired U232 and Th232 concentrations can be calculated.The data obtained by the alpha-spectrometric method using U232-Th228 spike are compared with colorimetric determination. Excellent agreement is obtained between the two sets of results. The coefficient of correlation is about 0.98 for U238 and 0.97 for Th232.The accuracy of uranium and thorium analyses by this method depends primarily upon the counting statistics of U238, U232, Th232 and Th228 and, to a lesser extent, upon the calibration of U232_Th228 spike. Errors of uranium and thorium concentration by this method are generally 2 to 5 per cent.
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【References】
Chinese Journal Full-text Database 5 Hits
1 Xia Ming (Institute of Geology, Academia Sinica, Beijing);DISCUSSION ON RESULTS OF THE URANIUM-SERIES INTERCOMPARISON PROJECT[J];Chinese Journal of Geology;1984-01
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【Co-citations】
Chinese Journal Full-text Database 8 Hits
1 Xia Ming (Institute of Geology, Academia Sinica, Beijing);DISCUSSION ON RESULTS OF THE URANIUM-SERIES INTERCOMPARISON PROJECT[J];Chinese Journal of Geology;1984-01
2 ;THE DETERMINED AGE OF THE U-SERIES CARBONATE REFERENCE MATERIALS[J];Marine Geology & Quaternary Geology;2007-06
3 Xia Xianming(Chengdu College of Geology) He Fuqing Peng Xiufeng Long Xianguan(720 Institute of Sichuan University);THE MEASUREMENT OF URANIUM SERIES OF CARBONATE STANDARDS[J];Journal of Mineralogy and Petrology;1985-01
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【Co-references】
Chinese Journal Full-text Database 3 Hits
1 ZHAO Xitao 1) ZHU Dagang 2) WU Zhonghai 2) MA Zhibang 1) ( 1) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing,100029; 2) Institute of Geomechanics, CAGS, Beijing,100081);The Development of Nam Co Lake in Tibet since Late Pleistocene[J];Acta Geosicientia Sinica;2002-04
2 Xia Ming (Institute of Geology, Academia Sinica, Beijing);DISCUSSION ON RESULTS OF THE URANIUM-SERIES INTERCOMPARISON PROJECT[J];Chinese Journal of Geology;1984-01
3 Luo Shangde Chen Zhen Shi Wenyuan Huang Yipu (Department of Oceanography);Anion-exchange Separation and Determination of Uranium and Thorium in Oceanic Samples[J];Journal of Xiamen University(Natural Science);1986-04
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