Measurement method of X-ray fluorescence analysis in which a collimated X-ray flux impinges on a smooth surface under a grazing angle; rendering total reflection is used to excite atoms in the top layers of the material for measurement of the amounts of elements.
Note:
The method is highly sensitive because interfering X-rays of higher energies are refracted or adsorbed. Mass fractions of \(\pu{E-12}\:(\pu{ng kg-1})\) may be measured.
Source:
PAC, 2021, 93, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 104 (https://doi.org/10.1515/pac-2019-0302)