Amptek X-123 Manuale d'uso - Pagina 4

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o The X-123-SDD is a high performance detector with broad applications in XRF. It has good resolution

(as low as 125 eV FWHM at

performance needed for most XRF applications at lower cost than the FastSDD.

o The X-123-SiPIN is recommended for cost sensitive XRF applications with less demanding resolution

and/or count rate requirements. It is available with areas of 6, 13, or 25 mm

of 150 to 200 eV FWHM at

o The X-123-CdTe is recommended for higher energy X-rays, above 30 keV or so. The 0.5 mm silicon

used in the other detectors loses sensitivity above 15 keV, while the CdTe detector remains near

100% efficient for all characteristic X-rays, to 100 keV. It is often used in characterizing X-ray tubes

as well as XRF for rare earth metals, lead, mercury, and other higher Z materials.

Extender

In the X-123, the detector is mounted on an extender, as seen in the photo above. This is usually

convenient for placing the detector inside shielding and in close proximity to a sample. The standard X-123

has a 1.5" extender but is available with a 3/8" extender (short), a 5" extender, and a 9" extender. The 5"

and 9" options are commonly used in vacuum applications, extending through a vacuum flange into a vacuum

chamber.

PA210/PA230 Interface

Another option, shown to the right, is to separate the detector/preamplifier from the rest of the

electronics, contained in the metal enclosure. A 10 pin flat flex connector runs from the preamp to the X-

123 box.

This has the advantage of more flexibility in mounting but can be more susceptible to

electromagnetic interference, grounding, etc.

Vacuum

The X-123 is suitable for vacuum applications, e.g. in EDS. The photo illustrates an X-123 with 9"

extender and vacuum flange. This is not suitable for high vacuum (Amptek provides other systems

appropriate for high vacuum) and the entire X-123 should not be placed in vacuum.

X-123 User Manual

Fe) and good count rates (tens to hundreds of kcps). It provides the

Fe. It is best at count rates of a few to tens of kcps.

with typical resolutions