Difference between wavelength dispersive and energy dispersive x ray fluorescence
Answers
Answer:
Explanation:
Direct answer for your question is that both of them (detection) will work for you.
In energy dispersive technique the characteristic X-rays are measured using a solid state detector which works on frame of X-ray energy dissipation in the active volume of the detector, followed by e-hole pair generation and their associated current pulses. The final energy dispersion measurement is possible only when there would be a matching external signal extraction, and here the charge sensitive pre-amplifier must be used (i.e. energy of incoming x-ray or particle is independent of the energy required for e-h pair generation in material of detector).
The second method is WDS, in general,(on Spectroscopy) the wavelength dispersion is achieved through the dispersive elements such as prism, grating, crystals. For x-rays the crystal are mostly used for obvious reasons. The detection is then done by various methods, for X-ray mostly the gas filled detectors are used.
If you compare the both, have their own benefits and limitations.
WDS provide better resolution than EDS, hence you may be more close to true value provided the calibrations and other associated things are at greater accuracy.
Due to electronics associated EDS may have more noisy spectrum
In WDS each element has to scanned, but EDS provide entire spectrum (within some limited range) in one time.