Wavelength dispersive X-ray fluorescence WDXRF

Wavelength dispersive X-ray fluorescence spectrometric (xrf) methods, 25 60 Wavelength dispersive spectrometer (WDS), 76 488, 26 433-434 Wavelength dispersive X-ray fluorescence (WDXRF)... 

The ASTM has published a method, based on x-ray fluorescence (XRF), for the determination of uranium and thorium in soil or rock samples (C1255 2011). The samples are dried and ground and the content of uranium is determined by a wavelength-dispersive x-ray fluorescence (WDXRF) device. The method is suitable for a concentration range of 20-1000 pg U (or Th) g soil, and the limit of detection of 20 pg g is pronounced to be sufficient for clean-up verification. 

Various combinations of the instrument components discussed in the previous section lead to two primary types of spectrometers wavelength-dispersive X-ray fluorescence (WDXRF) and energy-dispersive X-ray fluorescence (EDXRF) instruments. "... 

Table 8.38 Main features of wavelength-dispersive X-ray fluorescence spectrometry (WDXRF)...

WDXRF Wavelength dispersive x-ray fluorescence (analytical device)... 

X-ray Fluorescence (XRF) is a common technique for sulfur determination in hydrocarbon oils. At-line and laboratory XRF analysis is covered in the ASTM standard test methods for sulfur in petroleum products ASTM Standard Method D 4294 (for Energy Dispersive XRF, EDXRF) [1] and ASTM Standard Method D 2622 (for Wavelength Dispersive XRF, WDXRF) [2]. Polarized EDXRF [3] is also used at-line for the determination of very low sulfur content (<10 ppm sulfur) in diesel and gasoline fuels. 

Two types of instruments are available for X-ray fluorescence spectrometry wavelength-dispersive (WDXRF) and energy-dispersive (EDXRF). 

Figure 5.5 Comparison of EDXRF and WDXRF detection systems. Fluorescent X-rays are emitted by the sample on the left. The upper line shows a wavelength dispersive XRF system the lower shows an energy dispersive system. (Reproduced from Pollard and Heron 1996 44, by permission of the Royal Society of Chemistry.)...

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