What steps are involved in calibrating a dosimeter and ensuring traceability?

• A. Use a known, traceable calibration source; check energy/ angular response; document corrections; maintain calibration records traceable to national standards.
• B. Use any source; no documentation.
• C. Calibration is done once and never updated.
• D. Use random sources; but not traceable.

Answer: (A)

Calibrating a dosimeter and ensuring traceability means establishing an accurate, auditable link to national or international standards throughout the calibration process. Start with a known, traceable calibration source so the reference dose is tied to a recognized standard. Then verify the dosimeter’s response across the expected energy spectrum and radiation incident angles, because instruments can respond differently depending on energy and direction. Apply the appropriate correction factors to align the instrument’s readings with the true dose, and document these corrections along with the calibration conditions. Finally, maintain calibration records that clearly trace back to the standard sources, including dates, standards used, correction factors, and measurement uncertainties, so the dosimeter’s performance can be reviewed and trusted over time.

This approach is essential because dosimeters can drift with time, environmental conditions, or electronics aging. Without a traceable, well-documented calibration, dose measurements lose reliability, and regulatory or QA requirements are not met. Using non-traceable sources, skipping documentation, or assuming a one-time calibration remains valid forever would fail to provide the needed accuracy and accountability.