Final answer:
Calibration records for dose calibrators must be kept according to regulatory agencies' rules, often for three years in the United States as per NRC guidelines, but facilities should verify with their specific authorities.
Step-by-step explanation:
The duration for which calibration records on dose calibrators must be kept can vary according to the rules and regulations set forth by different regulatory agencies, such as the US Nuclear Regulatory Commission (NRC), the Environmental Protection Agency (EPA), or equivalent authorities in other countries. In the United States, for instance, the NRC requires that these records be maintained for a period of three years. It is important for facilities that use dose calibrators to check with their specific regulatory agency to ensure compliance with the applicable retention period rules. This is important to ensure the accuracy and reliability of the dose measurements taken by the calibrator. Keeping accurate records allows for traceability and quality assurance.