Abstract
The present work investigates the potential use of luminescent materials in tandem systems for diagnostic radiology. MgB4O7:Ce,Li (MBO) (Zeff = 8.1), borate glass (80–20MBO) (Zeff = 8.3) and Al2O3:C (Zeff = 10.9) are tested as optically stimulated luminescence (OSL) detectors. The first part of this work evaluates the energy response of the detectors exposed to standard radiation qualities, followed by the calculation of the tandem curve based on the ratio of the energy responses of the 80–20MBO/Al2O3:C and MBO/Al2O3:C detector pairs. The results indicate that the energy response of the OSL materials overresponds, for a low energy photon beam, by an order of 6 for Al2O3:C, 3.5 times for 80–20MBO and 1.7 times for MBO. The highest uncertainty in this measurement is found for Al2O3:C (16.6%). The results of the tandem analyses indicate that both pairs of detectors can be used for this application, although MBO/Al2O3:C had higher efficacy, compared to 80–20MBO/Al2O3:C. In both cases, the tandem curves are effective for energies below 50 keV, where steep energy behavior is observed and the highest uncertainty is observed for MBO/Al2O3:C (~18%).
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