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Radiation Protection Dosimetry Advance Access published online on August 30, 2008
Radiation Protection Dosimetry, doi:10.1093/rpd/ncn226
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

MULTICHANNEL DOSEMETER AND Al2O3:C OPTICALLY STIMULATED LUMINESCENCE FIBRE SENSORS FOR USE IN RADIATION THERAPY: EVALUATION WITH ELECTRON BEAMS

S. Magne1,*, L. Auger1, J. M. Bordy2, L. de Carlan2, A. Isambert3, A. Bridier3, P. Ferdinand1 and J. Barthe4

1 CEA, LIST, Laboratoire de Mesures Optiques, F-91191 Gif-sur-Yvette, France
2 CEA, LIST, Laboratoire National Henri Becquerel, F-91191 Gif-sur-Yvette, France
3 Institut Gustave Roussy, Service de Physique, 39 rue Camille Desmoulins, F-94805 Villejuif, France
4 CEA, LIST, Département des Technologies du Capteur et du Signal, F-91191 Gif-sur-Yvette, France

* Corresponding author: sylvain.magne{at}cea.fr

Received May 1, 2008

This article proposes an innovative multichannel optically stimulated luminescence (OSL) dosemeter for on-line in vivo dose verification in radiation therapy. OSL fibre sensors incorporating small Al2O3:C fibre crystals (TLD500) have been tested with an X-ray generator. A reproducible readout procedure should reduce the fading-induced uncertainty (~– 1% per decade). OSL readouts are temperature-dependent [~0.3% K–1 when OSL stimulation is performed at the same temperature as irradiation; ~0.16% K–1 after thermalisation (20°C)]. Sensor calibration and depth–dose measurements with electron beams have been performed with a Saturne 43 linear accelerator in reference conditions at CEA-LNHB (ionising radiation reference laboratory in France). Predosed OSL sensors show a good repeatability in multichannel operation and independence versus electron energy in the range (9, 18 MeV). The difference between absorbed doses measured by OSL and an ionisation chamber were within ± 0.9% (for a dose of about 1 Gy) despite a sublinear calibration curve.


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