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首页> 外文期刊>X-Ray Spectrometry: An International Journal >Choice of X-ray mass attenuation coefficients for PIXE analysis of silicate minerals and rocks
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Choice of X-ray mass attenuation coefficients for PIXE analysis of silicate minerals and rocks

机译：用于硅酸盐矿物和岩石的PIXE分析的X射线质量衰减系数的选择

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The accuracy of each of three mass attenuation coefficient databases was assessed using particle-induced X-ray emission measurements performed on well-characterized, homogeneous silicate glass and mineral standards. In a fundamental parameters computation, the absolute efficiency constants of the light elements Mg, Al and Si, found within each standard, were determined. These were compared with the efficiency constants deduced from separate particle-induced X-ray emission measurements performed on pure targets of the same three elements. In this comparison, a 7-9% discrepancy was found when using the XCOM database for the computation, but this was reduced to 2-5% when FFAST coefficients were substituted. Further improvement was achieved when a hybrid database was adopted. This Mixed' database consisted of primarily XCOM coefficients with FFAST values inserted for the light element (Z=11,..., 14) attenuation of photons having energy less than their K edge and for oxygen in the 1-2keV range. The average efficiency constant discrepancies were reduced to -0.5-2%. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：使用质量良好的均质硅酸盐玻璃和矿物标准品进行的粒子诱导X射线发射测量，评估了三个质量衰减系数数据库中每个数据库的准确性。在基本参数计算中，确定在每个标准中找到的轻元素Mg，Al和Si的绝对效率常数。将这些与效率常数进行比较，该效率常数是由对相同三个元素的纯目标进行的单独的粒子诱导X射线发射测量得出的。在此比较中，使用XCOM数据库进行计算时发现了7-9％的差异，但是当替换FFAST系数时，差异减小到了-25％。当采用混合数据库时，实现了进一步的改进。这个“混合”数据库主要由XCOM系数和FFAST值组成，FFAST值用于插入能量小于其K边的光子（Z = 11，...，14）衰减以及1-2keV范围内的氧气。平均效率常数差异减少到-0.5-2％。版权所有（c）2015 John Wiley＆Sons，Ltd.

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