The iXmini is a portable miniature X-ray source for detector calibration. It comprises an X-ray tube with an Fe or Cu anode.
The iXmini can be used for performing reliable flat field calibrations, making fluorescent metal foils and calibrants based on radioactive isotopes obsolete in your lab. With the iXmini, this calibration can now be done autonomously, even when there is no other X-ray source available, e.g. during downtime periods at synchrotrons. It’s also a simple and easy-to-use source for the regular checks of your radiation detection systems.
Features and Benefits
· Non-radioactive calibrant
· No special storage or handling permit needed as required for radioactive sources
· Simple and safe operation
· Operation in low level vacuum possible (down to 10-2 - 10-3 mbar)
· Small footprint with a size of 103 x 120 x 89.5 mm3
· Integrated HV generator and safety controller
· Two independent safety lines for integration in an interlock system
· Maximum power of 100 mW with operating parameters 4-10 kV and 2-10 µA
· Four pre-defined operation modes selectable through a control knob
103 x 120 x 89.5 mm
ca 1500 g
DC 24.0 V +/-1V
Metal ceramic miniature transmission anode
Iron (Fe) or Cupper (Cu) 150 nm on Beryllium window
Typical operational voltage
4.0 – 10.0 kV (anode to cathode)
The iXmini is an open X-ray emitter, which
immediately generates radiation, as soon as
24 V DC are switched on, and both interlock
lines are closed.
The iXmini requires an external 24 V DC power
supply which should be fused with 1 A. It does
not require any additional cooling.Power setting
The iXmini offers four pre-defined operating
modes with different power settings, which can
be selected by a control knob at the top of the
iXmini. The intensity of the X-rays emitted will
depend on the selected operation values.
The shutter of the iXmini is manually opened
before the power supply is turned on and the
interlock is closed and manually closed after the
power supply is turned off.
The iXmini has two warning lights, displaying
the status “X-RAY ON” and “BEAM ON”. During
ramp-up, these lights will flash. When reaching
full operation power, both lights will shine
Flat Field Calibration of a CMOS Detector
The iXmini was used for applying flat field calibration of a CMOS detector. The iXmini was
operated at 10 kV and 10 µA, using a Cu
anode. For the flat field correction, an image
with an exposure time of 1000 s was acquired.
Comparison of two 1000 s images, one without flat field correction (top) and one with flat field correction applied (bottom), together with the corresponding intensity variation over the whole image. As can be seen from the histograms, the homogeneity in the intensity distribution is improved significantly by applying the flat field correction.
Further, a set of flat field images was recorded with different exposure times in order to identify the minimum exposure time required for a good correction. The evaluation of this experiment shows that a reasonably good correction can already be achieved with a 600 s exposure time.
Improvement of the intensity homogeneity in dependence of the exposure time of the actual flat field image used for the correction. Reasonable statistics for the flat field correction are already obtained after about 10 min.