title: Multichannel dosemeter and Al2O3:C optically stimulated luminescence fibre sensors for use in radiation therapy: evaluation with electron beams.
abstract: 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 Al(2)O(3):C fibre crystals (TLD(500)) have been tested with an X-ray generator. A reproducible readout procedure should reduce the fading-induced uncertainty ( approximately - 1% per decade). OSL readouts are temperature-dependent [ approximately 0.3% K(-1) when OSL stimulation is performed at the same temperature as irradiation; approximately 0.16% K(-1) after thermalisation (20 degrees 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.
authors.affiliation: CEA, LIST, Laboratoire de Mesures Optiques, F-91191 Gif-sur-Yvette, France. sylvain.magne@cea.fr
authors.forename: S
authors.initials: S
authors.lastname: Magne
authors.forename: L
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authors.lastname: Auger
authors.forename: J M
authors.initials: JM
authors.lastname: Bordy
authors.forename: L
authors.initials: L
authors.lastname: de Carlan
authors.forename: A
authors.initials: A
authors.lastname: Isambert
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authors.lastname: Bridier
authors.forename: P
authors.initials: P
authors.lastname: Ferdinand
authors.forename: J
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authors.lastname: Barthe