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A Modified Mean Atomic Number Background Correction Using Off-Peak Interpolated Measurements

The Mean Atomic Number (MAN) technique for modelling and removing background X-ray radiation from characteristic X-ray signals significantly decreases analysis time by removing the need for background measurements on unknowns, while preserving excellent accuracy and even increasing precision on major, minor, and trace concentrations [1,2]. The calibration of the MAN background model requires the background radiation at the emission energies of interest to be measured directly in materials containing zero concentration of the element(s) of interest and across a range of mean atomic numbers likely to cover the primary standards and the unknown(s). Typical MAN standard materials consist of pure elements or simple binary compounds due to the need for high purity. Such standard materials rarely have the same mean atomic number as the unknown, meaning that the application of the background model to an unknown will likely rely on a range of mean atomic number between actual background measurements. Further, such high purity MAN standards tend to have more simple matrices than unknowns of interest, necessitating the use of more traditional standard suites in addition to the MAN standard suite, though as matrix corrections continue to improve in accuracy such matrix match considerations may no longer be necessary for primary standards.