SU‐E‐T‐117: Optically Stimulated Luminescence for Diagnostic and Therapeutic Low to Medium Energy X‐Ray Beams Experimental Dosimetry

• Published in: Medical Physics 2013-06, Vol.40 (6), p.230-230
• Main Authors: Spasic, E, Adam, J
• Format: Article
• Language: English
• Subjects: Aluminium; Bioengineering; Dosimetry; Electrons; Field size; Instrumentation and Detectors; Laser beam effects; Life Sciences; Medical diagnosis; Nuclear Experiment; Nuclear medicine; Optically stimulated luminescence; Particle beam detectors; Physics; Radiation therapy; Therapeutics
• ISSN: 0094-2405; 2473-4209
• DOI: 10.1118/1.4814552

Purpose: Optically stimulated luminescence (OSL) using aluminium oxide crystals (Al2O3:C) is a dosimetry technique (1), already validated in radiation therapy (2). The aim of this study was to characterize the OSL detectors in terms of energy dependence using monochromatic beams in the low‐medium energy range (25‐85 keV); and to evaluate their potential for experimental dosimetry in therapeutic applications at these energies. Methods: The OSL system is composed of a multichannel reader and alumina crystals (Al2O3:C, 0.09 mm3) that are remotely read by laser light. The OSL signal is directly linked to the absorbed dose. Irradiations in were performed at 8 energy points from 25 to 90 keV using a synchrotron source. Absolute OSL dose measurements were also performed at 80 keV at 2 cm depth in water equivalent phantoms (3) (1‐8 Gy range). The detectors have been read over 300 s to collect all the light available from the trapped electrons. Results: The OSL detector show a lower energy dependence (< 10%) in the 25 to 50 keV range than at higher energies (∼ 45% from 50 to 90 keV). OSL is a reproducible absolute dosimetry technique at 80 keV (sigma