Lambda 60K+250K

First developed at CERN’s laboratories, LAMBDA is based on the Medipix3 chip.

LAMBDA 60K provides fast, sensitive detection in a compact package and is designed for high-end X-ray imaging. With it, you get fast throughtput to suit the most demanding imaging tasks.

Technical Information

dimensions 150 x 85 x 42 mm3
weight 0.9 kg
cooling air- or water cooling

Sensor Options

Graphic

LAMBDA with High-Z sensor is well suited for energies above 20 keV

We have developed versions of the LAMBDA system where the Silicon sensor is replaced with one of the “high-Z” materials – Gallium Arsenide (GaAs) or Cadmium Telluride (CdTe). These provide greater detection efficiency at high X-ray energies. The result:

  • zero noise
  • high spatial resolution
  • high speed

The 2,000fps readout of a high-Z LAMBDA system is more than 1,000 times faster than a typical flat-panel detector. This allows time-resolved hard X-ray experiments on millisecond timescales.

Sensor material: Gallium Arsenide or
Cadmium Telluride

As shown in the photoelectric absorption graph, Cadmium Telluride has higher quantum efficiency than Gallium Arsenide at higher X-ray energies. This makes CdTe the natural choice for experiments at 60keV and above.

However, CdTe strongly re-emits fluorescence photons around 25–30keV when illuminated with higher-energy photons. This can reduce the detected signal and slightly blur the image.

So, GaAs is beneficial in the 25–50keV range. After flat-field correction, GaAs sensors also deliver better image uniformity.

If you’re considering using high-Z material, get in touch and we’ll find the best solution for your experiment.

Depending on the sensor material the following specifications are valid:

Si GaAs CdTe
Recommended option by energy range 6 – 24keV 8 – 75keV 8 – 150keV
Extendede energy range 6 – 25keV 25 – 50keV 50keV+
Adjustable threshold range 4 – 40keV 5 – 50keV 5 – 75keV