Figure 2 | Scientific Reports

Figure 2

From: PIBS: Proton and ion beam spectroscopy for in vivo measurements of oxygen, carbon, and calcium concentrations in the human body

Figure 2

EBT films irradiated by protons and ions of helium, carbon and oxygen. The five films in each row are the ones placed longitudinally within the sample and along the beam axis. They are ordered for an increasing density. The higher the density the shorter the path travelled within the sample. The irradiated distance = EBT irradiated film (cm) + 3.8 cm (first flask). (a) Film irradiated by a proton beam. A large penumbra and a very steep dose fall-off are observed. (b) Film irradiated by a helium beam. Lateral scattering is less evident, but a less steep dose fall-off is observed. (c) Film irradiated by a carbon beam. The spot is much sharper, but a considerable fragmentation after the stopping point is observed. (d) Film irradiated by an oxygen beam. The spot is very sharp, but at the cost of a very strong fragmentation after the stopping point.

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