The world's smallest and highest resolution room temperature gamma ray spectrometer

The GR1 is a CTZ-based high performance gamma-ray spectrometer. It is completely self-contained, with a built in preamplifier, shaping amplifier, baseline restorer, pulse height digitizer, and HV supply. The digitized pulse heights of detected gamma-ray signals are sent to a PC via the USB.

The GR1 comes with KSpect, Kromek’s entry level windows based software, built for detailed sample and spectral analysis. KSpect, which is available to download here, free of charge, provides the spectrum acquisition, display, analysis, and storage functions.

Gamma ray radiation detector spectrometer CZT based

Want to know more about the GR1 radiation detectors?

Gain access into our GR1 downloads area for product brochures and technical specifications

Main Features

  • High spectral resolution
  • High efficiency
  • Compact
  • Simple to use
  • CZT solid state detector
  • USB powered
  • Low power consumption

Product Benefits

  • Can be used straight out the box or built into your own device
  • Can be mounted together with other devices side by side in an array to give you coverage of a larger area
  • Powered entirely through the USB bus, so no external power supply is needed

Product Specifications

  • Energy resolution: <2.5% FWHM @662 keV
  • USB output only
  • 1cm cubed CZT detector


For users who are working in a multi source environment and need a better resolution, the GR1 Plus (+) is available. The plus model shows a better resolution for users who have a lot of different sources and need to differentiate between them easily. The GR1+ very accurately defines the source and the quantity of the source while in the environment/field.

For more information about the GR1

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