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Multichannel Dosemeter And Al_2o_3:c Optically Stimulated Luminescence Fibre Sensors For Use In Radiation Therapy: Evaluation With Electron Beams

机译:用于放射治疗的多通道剂量计和Al_2o_3:c光激发发光纤维传感器:电子束评估

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摘要

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_2O_3: C fibre crystals (TLD_(500)) 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 ℃)]. 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.
机译:本文提出了一种创新的多通道光激发发光(OSL)剂量计,用于放射治疗中的在线体内剂量验证。装有小型Al_2O_3:C纤维晶体(TLD_(500))的OSL光纤传感器已通过X射线发生器进行了测试。可重复的读出程序应减少衰落引起的不确定性(每十年约1%)。当在与照射相同的温度下进行OSL刺激时,OSL读数与温度有关[〜0.3%K〜(-1); (20℃)后〜0.16%K〜(-1)]。在CEA-LNHB(法国电离辐射参考实验室)的参考条件下,已使用Saturne 43线性加速器对传感器进行了校准,并使用电子束进行了深度剂量测量。预装的OSL传感器在多通道操作中显示出良好的可重复性,并且相对于电子能量范围(9,18 MeV)具有独立性。尽管存在亚线性校准曲线,但OSL和电离室测量的吸收剂量之间的差异在±0.9%以内(对于约1 Gy的剂量)。

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