Standardization of the absorbed dose at 3 mm depth in tissue in a ⁹⁰Sr/⁹⁰Y beta radiation field

Abstract The reduction of the dose limit for the eye lenses of occupational exposed workers drew the attention of authorities to review the monitoring, the calibration method and the performance of the individual dosimeters. Calibration laboratories are expected to perform dosimeter calibrations and tests in standardized and reliable conditions. In this work, the 90Sr/90Y beta radiation beam of the Beta Secondary Standard system was characterized. Beam standardization was achieved by measuring the absorbed dose rate at 3 mm in tissue, ?T(3). A reliable procedure for calibrating eye lens dosimeters in terms of Hp(3) in the 90Sr/90Y beta radiation field was established.