Another significant challenge was to find proficiency testing (PT) providers with appropriate measurement capabilities to meet ISO compliance requirements. The capabilities of the few established and reputable PT providers, such as the National Research Council of Canada (NRC), the National Institute of Standards and Technologies (NIST) and the International Atomic Energy Agency (IAEA), are limited to their well-characterized artefacts consisting of working measurement instruments for air kerma measurements. Their PT capabilities do not extend to field instruments such as personal dosimeters and gamma survey equipment. | Another significant challenge was to find proficiency testing (PT) providers with appropriate measurement capabilities to meet ISO compliance requirements. The capabilities of the few established and reputable PT providers, such as the National Research Council of Canada (NRC), the National Institute of Standards and Technologies (NIST) and the International Atomic Energy Agency (IAEA), are limited to their well-characterized artefacts consisting of working measurement instruments for air kerma measurements. Their PT capabilities do not extend to field instruments such as personal dosimeters and gamma survey equipment. |