New beam monitoring tool for radiobiology experiments at the cyclotron ARRONAX

Abstract : The ARRONAX cyclotron is able to deliver alpha particles at 68 MeV. In the frame of radiological research, a new method is studied to infer in situ the deposited dose: it is based on the online measurement of the bremsstrahlung (>1 keV) produced by the interaction of the incident particle with the medium. Experiments are made using bombarded poly(methyl methacrylate) (PMMA)-equivalent water targets in order to characterise this continuous X-ray spectrum. The intensity of the bremsstrahlung spectrum allows for the beam monitoring. A simulation code of the bremsstrahlung has been built, and a good agreement is found with the experimental spectra. With this simulation, it is possible to predict the sensibility of this method: it varies with the target thickness, showing a good sensibility for thin target (<1000 mm) and saturation for thicker ones. Bremsstrahlung spectrum also shows a sensibility on the target's chemical composition.
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L. Schwob, Charbel Koumeir, Noël Servagent, M. Chérel, Arnaud Guertin, et al.. New beam monitoring tool for radiobiology experiments at the cyclotron ARRONAX. Radiation Protection Dosimetry, Oxford University Press (OUP), 2015, 166 (1-4), pp.257-260. ⟨10.1093/rpd/ncv199⟩. ⟨in2p3-01951425⟩



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