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The radiation field of heavy-ion beams used for radiotherapy applications is significantly affected by nuclear fragmentation processes along the penetration path in tissue, causing an attenuation of the primary ion beam flux and the build-up of light fragments including fast neutrons. The emission of secondary fragments from 200 MeV/u carbon ions delivered from the synchrotron SIS-18 at GSI was investigated using a water absorber as tissue-equivalent beam stopping target. Energy spectra, angular distributions and yields of fast neutrons and charged particles emerging from the absorber downstream were investigated by using fast scintillation detectors and time-of-flight techniques. From the resulting yield of 0.54 neutrons (E |
