QUEST: quantitation using an elemental standardless technique for energy dispersion analysis.

摘要: Abstract A computerized quantitative system for standardless energy dispersion X-ray analysis of bulk specimens has been developed. The program is composed five main modules controlling: pulse height acquisition, background correction, peak locating, deconvolution, and quantitation. Unique features include the use a spline interpolation simplex optimization. For removal third order procedure was used to calculate specific Y value (background height) each X (energy) continuum then removed by pointwise subtraction computed from raw spectrum. When overlapping peaks were present deconvoluted prior optimization algorithm assumes be Gaussian minimizes sum squares observed spectral intensity minus calculated successive iterations yield estimates areas. In quantitation module, normalization factors based on assumption that if amount primary ionizations produced pure element under standard excitation conditions can converted constant factor, series these convert corrected areas into relative composition. These preliminary are further detector absorptions, fluorescence absorption in specimen obtain weight percent estimate elemental final an “infinitely” thick metal or randomly oriented crystalline typically within ± 7% error 3 units known