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4. X-123 Options and Variations

4.1.

Detector

The X-123 is available with any of Amptek's standard detectors: FastSDD, SDD, SiPIN, and CdTe. Each of

these is recommended for a different application and the X-123 hardware will only accommodate one

detector type.

4.1.1.

The X-123 FAST SDD® is Amptek's highest performance detector, providing both the highest

resolution (as low as 122 eV FWHM at 55Fe) and highest count rates (above 1 Mcps). It is available with

the C2 low energy window, for measuring low energy X-rays, down to the Be Kα line. The X-123 FAST

SDD® is recommended for count rates > 100 kcps and, with the C2 window, for measurements < 1 keV.

4.1.2.

The X-123-SDD (now obsolete) is a high-performance detector with broad applications in XRF. It

has good resolution (as low as 125 eV FWHM at 55Fe) and good count rates (tens to hundreds of kcps).

It provides the performance needed for most XRF applications, previously offered at a lower cost than

the FastSDD.

4.1.3.

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

resolutions of 150 to 200 eV FWHM at 55Fe. It is best at count rates of a few to tens of kcps.

4.1.4.

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.

4.2.

Extender Options

4.2.1.

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

the left. 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.

4.3.

PA210/PA230 Interface

4.3.1.

Another common option, shown to the right above, 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

X-123 User Manual

with typical