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New Accurate Bence‐Albee α‐Factors for Oxides and Silicates Calculated from the PAP Correction Procedure
Author(s) -
Kato Takenori
Publication year - 2005
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2005.tb00657.x
Subject(s) - ion , oxide , chemistry , analytical chemistry (journal) , chromatography , organic chemistry
A new α‐factor table for the Bence‐Albee correction method of quantitative electron microprobe analysi is presented for an accelerating voltage of 15 kV and a take‐off angle of 40 degrees. The α‐factors were calculated from the full PAP correction with least squares fitting in the range 0.1–50% m/m in C/K‐C space, with the assumption that C/K = 1 for C = 1, where C is the weight fraction of the emitting element as oxide or anion in binary oxide‐oxide, oxide‐anion or anion‐anion systems, and K is the relative X‐ray intensity ratio between compound and pure oxide or anion. Recently determined mass attenuation coefficients were chosen. X‐ray intensities were calculated for binary oxide‐oxide, oxide‐anion and anion‐anion systems. For the twelve major elements that characterise most geological samples, maximum deviations of α‐factors in this study were smaller than 10 % and most deviations were less than 1%. The new α‐factor table improves the accuracy of the Bence‐Albee method compared with previous studies, and provides results as accurate as the full PAP correction when absorption is not large.