Simultaneous Determination of Uranium and Thorium in Ores by X-ray Fluorescence Spectrometry
Received:February 09, 2015  Revised:April 16, 2015
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DOI:doi:10.3969/j.issn.2095-1035.2015.03.008
KeyWord:X-ray fluorescence spectrometry; simultaneous determination; powder sample preparation; uranium; thorium
  
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JING Hui 广西三一0核地质大队,广西 桂林
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Abstract:
      A method for the determination of uranium and thorium in ores was established by X-ray fluorescence spectrometry. The samples were made by high pressure powder sampling preparation method. Experiment parameters, such as tablet pressure, particle size, moisture content and dosage of radioactive sample with different concentrations, were investigated through single factor tests. The samples were pressed under 400 MPa to overcome the disadvantages of low press sampling preparation method, which making the samples pressed smooth and compact. This sampling preparation method could improve obviously the reproducibility of samples, and effectively reduce the part of the matrix effect. The standard deviations of uranium and thorium in calibration curve were reduced to 0.0071% from 0.053% and to 0.0057% from 0.062%, respectively. The method was validated by the analysis of national reference materials. The results showed that the proposed method was accurate and reliable for determining uranium and thorium content in ores for daily analysis.
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