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Full Field XRF

Full Field XRF​




High performances position- and energy- sensitive X-ray detectors have boosted the development of advanced instruments based on the Full Field X-Ray Fluorescence (FF-XRF) method providing a promising alternative to the conventional scanning approach for performing the two-dimensional elemental imaging.

FF-XRF works by using a broad X-ray beam for illuminating a large area (or even the full area) of a sample. The X-ray fluorescence induced by the primary radiation is detected on a position- and energy-sensitive detector, through a pinhole-collimator (or an Xray polycapillary) positioned between the sample and the detector. The selective detection of the characteristic X-rays hitting the detector allows to obtain the two-dimensional elemental distribution of the investigated samples.

The instrument available at NSIL uses different nozzles and collimators in front of the detector as to attain different values of magnification and spatial resolution:

x-ray tube

Two options

Anode material

Mo

Max. HV (kV)

50

Max current (uA)

40000

600

Detector

ANDOR CCD

Working temperature (oC):

- 85

Pixels

1024 x 1024

Pixel size (um)

12 x 12

Energy resolution (eV):

145

Nozzle length (mm)

45

45

15

10

Collimator inner diameter (um)

15

25

25

100

Sample to nozzle distance (mm)

15

40

60

95

Spatial resolution (um):

20

40

60

350

Magnification (x):

5

2

0.8

0.4










FF-XRF.jpg





FFXR geom.jpg