Testing the [formula omitted] procedure using TLDs and OSLDs and a lexsyg smart automated reader for precise dosimetry

Abstract

This work demonstrates the precision achieved with thermoluminescence (TL) and optically stimulated luminescence (OSL) detectors (TLDs and OSLDs) using a procedure that takes advantage of the capabilities of automated TL/OSL readers (lexsyg smart), for potential applications in medical dosimetry. The procedure makes use of the 90Sr/90Y beta source present in the reader to correct for sample-to-sample sensitivity variations. Typical data obtained using four types of TLDs (LiF:Mg,Ti, LiF:Mg,Cu,P, CaF2:Tm, Al2O3:C single crystal) and two types of OSLDs (BeO and Al2O3:C film) are presented along with the estimated uncertainties achieved. The results demonstrate that the material-specific optimized procedure enables a precision (standard deviation of the data) better than 3% in the 0.2Gy–2Gy dose range with all the materials, except for the TL signal of Al2O3:C single crystal. The highest precision (¡ 1%) is achieved using the OSL from Al2O3:C film over a wide dose range (∼0.2Gy to 10Gy).