Setup description

The X-ray setup consists of a radiation shielding enclosure hosting a downward pointing X-ray source. Interlock devices allow to operate the setup in a fully safe condition.

Specifications of the Hamamatsu microfocus X-ray source L9421-02

  • Voltage range: 0-90 kV
  • Current range: 0-200 μA (maximum current depends on voltage)
  • Output window material: 150 μm thick Be
  • Focal spot size: 7 μm @ 90 kV (5 μm @ 90 kV/4 W)
  • Maximum X-ray emission angle: ~ 39 degrees
  • Focal length from X-ray output window (FOD): 9.5 mm
  • Tungsten target

Experimental settings

The setup is currently equipped with the following experimental settings.

Transmission

In this case the detector is simply placed in front of the source. Between the detector and the source a sample can be placed, as well as a beam filter (e.g. 20 mm Al).

Fluorescence

The primary beam is sent to a metal sample. The detector is placed in the backward direction in order to detect the fluorescent photons emitted from the sample. The detector is enclosed in a lead shield in order to prevent contamination from background radiation.

Computed Tomography

Between the source and the detector a stepper motor is placed which allows controlled rotation of the sample while the X-rays are shot. The alignment of the stepper motor axis with respect to the detector is ensured by a system of micrometric translational and tilting stages.

Topic revision: r2 - 2012-03-28 - MartinVanBeuzekom
 
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