Instruments and equipment used for quantitative radiation measurements are required to be calibrated on an annual basis according to chapter 3701: 1-38-14 of the Ohio Administrative Code. Meters being used for licensed activities should always have a current calibration sticker and certificate on file from either Radiation Safety or the manufacturer. Radiation Safety maintains a database of current “in use” meters used by both research labs and clinical areas within the OSU Wexner Medical Center. Meters are picked up, calibrated, and returned within three business days during the calendar month of the calibration due date. Major repairs or calibrations that cannot be performed must be done by returning the instrument to the manufacturer at the lab's cost.