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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Submitted on : Wednesday, December 12, 2018 - 9:25:34 AM
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L. Schwob, C. 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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