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Calibration Research & Accreditation


Please visit the NIST - NVLAP site to download the most current versions of the Scope of Accreditation and the Certificate of Accreditation.

NVLAP Accredited Calibration Laboratory for Ionizing Radiation

The Calibration, Research and Accreditation Group (CR&A) operates and maintains the Calibration Laboratory for Ionizing Radiation (CLIR) located at the Pacific Northwest National Laboratory (PNNL). The CLIR is accredited (Lab Code: 105020-0) through the National Voluntary Laboratory Accreditation Program (NVLAP) and meets the quality requirements of ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories, via the interpretation of NVLAP Handbook 150, NVLAP Procedures and General Requirements. Currently, our laboratory is accredited for calibration of reference and survey class radiation detection instruments and irradiation of personnel radiation dosimetry devices and other artifacts in manners traceable to the National Institute of Standards and Technology (NIST) using the following radiation types:

  • Photon Sources (241Am, 137Cs, 60Co)
  • X-rays (various ISO-specified and NIST-specified techniques)
  • Beta (85Kr, 90Sr/90Y)
  • Neutron (unmoderated and D2O-moderated 252Cf sources)

Measurement Uncertainty Analysis

As part of our responsibility as an accredited calibration laboratory, CR&A has evaluated the uncertainty for commonly applied radiological and measurement standards and has further propagated those estimated uncertainties to radiation detection devices being irradiated and/or calibrated. The applied uncertainty analysis methodology is consistent with NIST Technical Note 1297 and the ISO Guide to the Expression of Uncertainty in Measurement. Uncertainty estimates are provided for tasks performed under the current scope of accreditation and, when requested, for tasks outside the scope.

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