Wavelength-dependent optical bleaching in Al₂O₃:C nanoDot optically stimulated luminescence dosimeters
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DOI:
https://doi.org/10.31349/RevMexFis.72.061102Keywords:
optically stimulated luminescence dosimeters, optical bleaching, wavelength dependence, Al2O3:C, residual signal decay, clinical dosimetryAbstract
The reusability of Al2O3:C-based optically stimulated luminescence dosimeters (OSLDs) relies on efficient removal of the stored signal through optical irradiation. Wavelength-dependent optical bleaching was evaluated in nanoDotTM dosimeters using 3 W LED matrices centered at 463 and 516 nm, with irradiances of 587.7 and 457.7 mW·cm−2, respectively. Dosimeters irradiated with 6 MV photons were subjected to successive 5-min bleaching cycles with intermediate microStar readouts. The 463 nm system produced faster signal reduction and higher bleaching efficiency than the 516 nm system. A residual component persisted after prolonged irradiation, indicating incomplete depletion of optically accessible trapping states under the evaluated conditions. These results support wavelength selection as a key parameter for optimizing nanoDot reuse protocols.
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Copyright (c) 2026 Miguel Ángel Camacho López, Isabel Morales Peña, Amanda García Garduño, Rosalía Contreras Bulnes , Adrián Sánchez Aguilar
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