User Stories

Mirion Technologies

Mirion Technologies building new products using Kromek detectors

Mirion packages the GR1 spectrometer into an application called the CSM, or continuous spectroscopic monitor. This package combines the spectrometer with shielding and data acquisition software to provide real-time monitoring of high count rate applications such as those found in nuclear power plant reactor coolant facilities.

Reactor fluid in nuclear power plants contains many radioactive isotopes. The relative ratio of different isotopes in the reactor fluid is an indicator of the state of the reactor and can be used to inform reactor operators of different actions that can be used to improve the performance of the reactor. By being able to identify specific isotopes in the reactor fluid and being able to monitor the activity of these isotopes as a function of time near the reactor itself, this increases the amount of information reactor operators have about the performance of the reactor.

The GR1 unit is ideal for this application due to its:

  • small physical size, allowing it to be positioned near a reactor coolant pipe;
  • an excellent spectroscopic resolution, allowing individual nuclides to be identified;
  • low intrinsic efficiency, as dose rates are very high in these environments.


The quality of the CZT crystal and spectroscopic performance is really quite excellent.
The resolution is the best of room temperature devices, and the peak shape is also much improved upon other CZT crystals. Historically a significant tail was a feature of peaks in a CZT spectrum, which would require careful peak fitting routines. This is not a significant issue with the GR1 units.

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