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《Chinese Journal of Geology》 1984-01
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DISCUSSION ON RESULTS OF THE URANIUM-SERIES INTERCOMPARISON PROJECT

Xia Ming (Institute of Geology, Academia Sinica, Beijing)  
The Phases I, II and III of the Uranium-Series Intercomparison Project (USIP) consist of the analysis of same natural carbonate samples by between-laboratories in defferent coutries, aim at checking against systematic errors in the procedure and age calculation, and prove the valid analytical technique for dating by U-series geochronology.A statistical analysis of USIP results-Phases I, II and III, including U contents, 230Th/ 234U, 234U/238U activity ratios and 232U spike concentration as well as parameters, indicates a good interlaboratory agreement. Sources of total analytical errors can be divided into three types: (1) counting statistic, (2) the error caused by the chemical procedure, degree of spectral resolution and peak tail corrections, extent of sample homogeneity and spectral interpretation, and (3) radom uncertainty.Our laboratory is involved in the USIP Phases II and III. The results show that our data are in good agreeable with the "best estimate" mean values. Dissolution and chemical procedure and source preparation for carbonate samples are examined in detail in order to identify the reasons for variation in chemical yields, thus enabling consistently high yields to be achieved. Methods of the data-processing used in measurement of isotopic ratios and calculation, and determination of correcting factors have been carried out. This indicates that a standardization of age calculation procedures for U-series geochronology is required.The 232Th solution used as the spike in chemical procedure in order to attempt at determining the age of geological samples. The experimental results suggest that if the sample remained a closed system and U concentration was known, the approach to age-determination would be appropriated.In addition, two factors of influence, 210Po and △ 228Th for determining the 232U concentration in the spike and dating geological samples are discussed here. The maxium influence of residual 228Th ( △ 228Th) on the total counts of 232U can reach 2%. It is necessary to make a correction for △228Th. In some cases, where an uraninite is taken as the standard solution to calibrate to concentration of 232U, considerable amounts of 210Po in alpha-spectrum of uranium isotopes would cause unacceptable uncertainties.
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【Citations】
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【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 Xia Ming Zhou Xiuyun(Institute of Geology, Academia Sinica) (Institute of Geochemistry, Academia Sinica);ALPHA-SPECTROMETRIC DETERMINATION OF URANIUM AND THORIUM IN GEOLOGICAL SAMPLES[J];Geochimica;1982-03
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8 Chen Tiemei Yuan Sixun Gao Shijun (Dating Lab., Department of Archaeology, Peking Univ.);THE STUDY ON URANIUM-SERIES DATING OF FOSSIL BONES AND AN ABSOLUTE AGE SEQUENCE FOR THE MAIN PALEOLITHIC SITES OF NORTH CHINA[J];Acta Anthropologica Sinica;1984-03
9 Zhao Shusen, Liu Minglin ( Institute of Geology, Academia Sinica ) Wang Xunyi (Institute of Karst Geology, Ministry of Geology and Mineral Resources );(234)~U/ (238)~U DATING OF THE STALAGMITE[J];Carsologica Sinica;1986-02
10 Shi Wenyuan Luo Shangde Huang Yipu (Department of Oceanography);The Separation of U, Th And the Determination of U-Series Age in the Geological Carbonate Samples[J];Journal of Xiamen University(Natural Science);1985-04
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Chinese Journal Full-text Database 10 Hits
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