Abstract
It is insufficient for laboratories to claim measurement traceability simply through the possession of standard reference materials, traceable reference materials, or instrument calibrations because of the potential for improper use. Independent testing of measurement traceability is the only mean by which it is truly demonstrated. The National Institute of Standards and Technology’s (NIST) radiochemistry intercomparison program evaluates environmental measurement traceability and it must have the highest confidence in its reference values. Verification measurements provide NIST with confidence in the reference values. However, it is proposed that a simple t test based on the PT test results be used to independently evaluate the accuracy of the reference values.
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