Fast neutrons produced by nuclear fragmentation in treatment irradiations with 12C beam

1 August 2004

journal article
research article
Published by Oxford University Press (OUP) in Radiation Protection Dosimetry

Vol. 110 (1-4) , 595-600
https://doi.org/10.1093/rpd/nch138

Abstract

In the framework of the heavy-ion tumour therapy project at GSI we investigated the nuclear fragmentation of 200 AMeV carbon ions stopping in a 12.78-cm thick water absorber. Fast neutrons and charged particles emerging from the target were registered at forward angles between 0° and 30° with a ΔE-E-telescope consisting of an NE102 and a BaF₂ scintillator. We obtained neutron energy spectra and angular distributions and derived the neutron yield in the energy range from 10 to 500 MeV in the forward hemisphere. In addition, we performed fragmentation measurements in actual patient treatment irradiations. The resulting angular distributions of neutrons and charged particles as well as their yields are similar to those obtained with the water absorber.

Keywords

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