How to choose a radiation calibration vendor
A practical evaluation framework covering accreditation, turnaround, scope, traceability, and the questions to ask before sending instruments out for service.
Calibration vendor selection is one of the most consequential procurement decisions an RSO makes — and one of the most underexplained in the literature. This guide walks through the criteria that actually matter.
Accreditation.ISO/IEC 17025 accreditation is the floor, not a differentiator. Look for the scope of accreditation document — many labs are accredited for some quantities and not others. A lab accredited for exposure rate but not for tissue equivalent dose will hand you a certificate that doesn't actually cover your survey meter use case.
Traceability.NIST traceability should be documented through an unbroken chain. Ask for the lab's most recent NIST round-robin or NVLAP proficiency test results. Reputable labs share them.
Turnaround.Five to ten business days is the industry standard for routine calibration. If a vendor quotes three-week turnaround, that's a capacity problem, not a feature.
Scope.Survey meter calibration is straightforward. Dosimetry system calibration, neutron source calibration, and high-range calibration each require different sources and shielding. Vendors who handle all of it under one roof are rare.
Pickup and return.For multi-instrument programs, ask whether the vendor provides shipping containers, prepaid return shipping, and online status tracking. The economics work out very differently when you're paying $40 each way per shipment versus a flat program rate.
The right vendor for a research university with twelve detectors is rarely the right vendor for a nuclear utility with three hundred. Right-size the relationship to your program.
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