LAMBDA for Electron Microscopy

Each of our detectors can be used in vacuum and for electron detection. Vacuum units are always water-cooled.

Our standard configurations range from 60K pixels through to 2M pixels. But we know that each research experiment differs, and so we’re flexible in desining customised configurations for your experiments.

Get in touch to discuss your needs and we’ll create a setup that gives you small pixels, high frame rates and absolutely no slow-downs.

Sensor Options

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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
Energy range: 6 – 25 keV 8 – 75 keV 8 – 150 keV
Adjustable threshold range: 4 – 40 keV 5 – 50 keV 5 – 75 keV