What is X | 合法醫療器材資訊網

TraditionallyXRFhasbeenabulktechniquewithanalysisspotsintheregionofseveralmillimetersthroughtoseveralcentimeters.Inhomogeneoussampleshave ...

A wavelength dispersive detection system physically separates the X-rays according to their wavelengths.

The X-rays are directed to a crystal, which diffracts the X-rays in different directions according to their wavelengths (energies).

On a sequential system a detector is placed at a fixed position, and the crystal is rotated so that different wavelengths are picked up by the detector. The XRF spectrum is built up point by point. In a simultaneous system, a number of crystal/detector units are used, so that a range of elements can be detected simultaneously.

The principal difference between ED and WDXRF techniques lies in the achievable energy (spectral) resolution. WDXRF systems can routinely provide working resolutions between 5 eV and 20 eV, depending on their set up, whereas EDXRF systems typically provide resolutions ranging...