Determination of Element in Brass by Non-Dispersion X-ray Fluorescent Analysis

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  • 非分散型螢光X線分析による黄銅各成分の定量
  • ヒブンサンガタ ケイコウ Xセン ブンセキ ニ ヨル オウドウ カク セイブン ノ テイリョウ

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A fluorescent X-ray analysis by non-dispersion method was applied for the determination of some elements in brass. The absorption filter was principally used to select the characteristic X-ray in the element. The apparatus of this type was simple and small comparing with other dispersion type. In order to determine the element with small probable error, it must be considered that (A) an appliing voltage of X-ray source is about 2∼3 times the voltage of minimum excitation voltage of the element, (B) a profitable material and a suitable thickness is chosen for the filter. The probable error for the determination could be calculated from the ratio of characteristic X-ray to background counting rate and the total number of counts. The characteristic X-ray from the brass, which had a similar composition to the sample but did not contain the element to be analysed, was thought as the background. The probable error obtained by the X-ray analysis agreed well with the error calculated. The X-ray analysis was done by the calibration curve method and each calibration curve showed linear relation between the weight percentage of element in brass and its X-ray intensity, and was influenced little by other elements. The probable error of the experiment were 0.30% for Cu, 0.025% for Fe, 0.08% for Sn and 0.05% for Pb in 60/40 brass with the counting time 30∼100 sec.

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