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IEEE Transactions on Nuclear Science 57 (5) (2010) 2768-2772
Monte Carlo simulations of prompt-gamma emission during carbon ion irradiation
F. Le Foulher1, M. Bajard1, M. Chevallier1, D. Dauvergne1, N. Freud2, P. Henriquet1, S. Karkar3, J.M. Létang2, L. Lestand4, R. Plescak, C. Ray1, D. Schardt, E. Testa1, M. Testa1

Monte Carlo simulations based on the Geant4 toolkit (version 9.1) were performed to study the emission of secondary prompt-gamma rays produced by nuclear reactions during carbon ion-beam therapy. These simulations were performed along with an experimental program and instrumentation developments which aim at designing a prompt-gamma ray device for real-time control of hadrontherapy. The objective of the present study is twofold: firstly, to present the features of the prompt-gamma radiation in the case of carbon ion irradiation; secondly, to simulate the experimental setup and to compare measured and simulated counting rates corresponding to four different experiments. For each experiment, we found that simulations overestimate prompt-gamma ray detection yields by a factor of 12. Uncertainties in fragmentation cross sections and binary cascade model cannot explain such discrepancies. The so-called “photon evaporation” model is therefore questionable and its modification is currently in progress.
1 :  IPNL - Institut de Physique Nucléaire de Lyon
2 :  CNDRI - Controle Non Destructif par Rayonnements Ionisants
3 :  CPPM - Centre de Physique des Particules de Marseille
4 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
Physique/Physique/Physique Médicale

Informatique/Imagerie médicale

Informatique/Modélisation et simulation
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