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黄金首饰的表层元素经X射线激发,发射出特征X射线荧光能量光谱线。不同元素的能量光谱线与其含量存在着特定的线性关系。能量色散X射线荧光光谱仪通过采用脉冲高度分析器和配套的相关软件将不同能量的脉冲分开,找出相应的元素,测量相应元素的具体含量值。通过X射线荧光光谱仪对黄金首饰的金含量测出的一系列测量值,依据GB/T18043-2013对黄金首饰样品金含量的不确定度进行计算。对采用的黄金标准物质运用最小二乘法建立数学模型,以标准值为x,3次测量值的平均值为y,找出线性关系方程。通过标准物质的运用,当置信因子k=2时,最终分别计算出18K金样品、足金样品金含量的扩展不确定度。
The surface elements of gold jewelry are excited by X-rays and emit characteristic X-ray fluorescence energy spectral lines. There is a specific linear relationship between the energy spectral lines of different elements and their contents. Energy dispersive X-ray fluorescence spectrometer through the use of pulse height analyzer and related software to separate the different energy pulse to find the corresponding elements, measuring the specific content of the corresponding elements. The gold content of gold jewelry measured by X-ray fluorescence spectrometry measured a series of values based on GB / T18043-2013 gold jewelry sample gold content uncertainty. The use of gold standard material using the least squares method to establish a mathematical model, the standard value of x, 3 times the average of the measured values of y, to find the linear relationship equation. Through the use of reference materials, when the confidence factor k = 2, the final uncertainty of the gold content of 18K gold and 18K gold were calculated.