How often should survey instruments and dosimeters be calibrated, and who is typically responsible?

• A. Monthly; performed by department staff.
• B. Annually or per manufacturer recommendations; performed by a qualified service provider under RSO oversight.
• C. Daily; performed by nurses.
• D. Only when first purchased; performed by vendor.

Answer: (B)

Calibration keeps survey instruments and dosimeters producing accurate readings over time. The standard practice is to calibrate them on a schedule defined by the manufacturer and regulatory guidance—typically annually—and to follow any manufacturer recommendations for more frequent checks. This work is performed by a qualified service provider, and it is overseen by the Radiation Safety Officer. The qualified provider has access to traceable reference standards, proper calibration equipment, and the documented processes needed to verify and adjust the instruments so their readings remain accurate.

Why these elements fit: annual calibration and adherence to manufacturer guidance ensure the equipment stays within acceptable accuracy limits and remains compliant with regulatory requirements. Having a qualified service provider guarantees that calibration is done correctly, with traceability to national standards, and that proper documentation is maintained. Oversight by the Radiation Safety Officer ensures the calibration program is managed consistently and that any maintenance or corrective actions are properly recorded.

Short context on the other options: monthly checks by department staff or daily checks by nurses would lack the specialized equipment and traceability required for reliable calibration. Calibrating only when first purchased ignores drift, wear, and potential damage that can occur over time.