Measurement for our planet
Measurement for our planet

As COP26 approaches, discover how NPL plays a key role in enabling climate action through the delivery of accurate, reliable data that supports decision making and enables low carbon innovation.

Ionising radiation protection

Environmental dose rate monitor calibration service

Accurate calibration

Regulatory agencies, local authority monitoring laboratories and the nuclear industry all require accurate, well calibrated instruments in order to monitor environmental dose rates at successively lower levels. NPL's calibration service is specifically tailored for environmental dose rate monitors used for air kerma measurements at very sensitive levels (i.e. 100x lower than protection levels).


  • Calibrations are traceable to UK national standards for secondary standards and commercially available low-level, hand-held area monitors, e.g. Mini Instruments, Reuter-Stokes and proportional counters.
  • Calibrations are available by arrangement.
  • Gamma radiation from 137Cs sources is used at a range of air kerma rates from 50 nGy/hr to 200 nGy/hr.

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Our research and measurement solutions support innovation and product development. We work with companies to deliver business advantage and commercial success.
Contact our Customer Services team on +44 20 8943 7070