  The usual method for determining the sensitivity curve of a TXRF spectrometer
relies on calibration using a set of vendor-certified concentration values of
reference calibration standards. These samples, which are certified by the
provider, are costly and their quality cannot be verified. We propose the use
of pure substances for calibration, along with a mathematical procedure, that
assures a high precision and accuracy of the results. The method described
herein is economically efficient and eliminates having to deal with some
uncertainties related to the concentration of the standard used in the usual
method, thereby improving the quality of the TXRF results.

Atomic Physics