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Multichannel OSL dosimetry for dose verification in radiotherapy

Sylvain Magne 1, * Loïc de Carlan 2 Soizic Sorel 2 Aurélie Isambert 3 André Bridier 3 Pierre Ferdinand 1 Jean Barthe 4
* Corresponding author
1 LCFO - Laboratoire Capteurs Fibres Optiques
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
2 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
4 LM2S - Laboratoire Modélisation et Simulation de Systèmes
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : An innovative multichannel fibre-coupled Optically Stimulated Luminescence (OSL) dosimeter is proposed for on-line in vivo quality assurance in Radiation Therapy (RT). Small Al2O3 :C fibre crystals (TLD500) are used as OSL detectors, incorporated into a rugged, radiation-resistant and radiation-transparent OSL fibre sensor design. The temperature and fading dependences of OSL fibre sensors and stability vs cumulated dose have been tested with a X-ray generator. Predosed OSL sensors tested at Institut Gustave Roussy (IGR) show a good repeatability in multichannel operation. Sensor calibration and depth-dose measurements with electron beams have been performed with a Saturne 43 LINAC in reference conditions at CEA-LNHB (ionizing radiation reference laboratory in France). The difference between absorbed doses measured by OSL and an ionization chamber was within ± 0.9 % (for a dose of about 1 Gy) despite a sublinear dose response. Finally, a single calibration curve was used for all beams as energy independence vs electron energy was found in the range [9 MeV, 18 MeV]. Angular independence was found as well in the range [0°, 45°] when the OSL sensor is equipped with its bolus.
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  • HAL Id : cea-01840770, version 1

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Sylvain Magne, Loïc de Carlan, Soizic Sorel, Aurélie Isambert, André Bridier, et al.. Multichannel OSL dosimetry for dose verification in radiotherapy. 12th International Congress of the International Radiation Protection Association (IRPA), International Society of Radiology, Oct 2008, Buenos Aires, Argentina. ⟨cea-01840770⟩

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