What is the purpose of calibration of survey instruments and dosimeters, and who typically performs it?

• A. To ensure readings are accurate; calibration by authorized laboratories or device manufacturers; often performed by the RSO or vendor
• B. To check battery life only
• C. To replace sensors
• D. To adjust shielding thickness

Answer: (A)

Calibration ensures readings from survey instruments and dosimeters reflect the true radiation level. Detectors can drift over time due to aging, temperature, and other factors, so comparing their response to a known standard and applying the correct calibration factors keeps measurements accurate. This accuracy is essential for reliable dose assessment and protective actions. Calibration is performed by authorized, accredited calibration laboratories or by the device manufacturers, and the work is typically coordinated by the Radiation Safety Officer or the vendor, who also keeps the calibration certificates and records. It’s not about battery life, replacing sensors, or adjusting shielding; those are separate maintenance or design tasks.