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

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

Find out more about the GR1 Gamma-Ray Spectrometers

Download the GR1 Brochure

A PDF with the complete specifications for the GR1 family.

Speak to our experts about the GR1

Make sure the GR1 meets your needs and your budget.


For users who are working in a multi source environment and need a better resolution, the GR1 Plus (+) is available. The plus model has a better resolution allowing users who are measuring multiple peaks to differentiate between them more accurately than with the GR1. The user is then able to determine a more precise measure of the number of counts relating to the peaks they are analysing.

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