wavelength-dispersive X-ray fluorescence analysis 

https://doi.org/10.1351/goldbook.W06662
A kind of X-ray fluorescence analysis involving the measurement of the wavelength spectrum of the emitted radiation e.g. by using a diffraction grating or crystal.
Source:
PAC, 1994, 66, 2513. (Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)) on page 2526 [Terms] [Paper]