Comments on recent measurements of the stopping power of liquid water

Abstract

Two experiments about the stopping power of liquid water for proton beams have recently been reported. The one by the Jyväskylä group (4.8–15.2 MeV) agrees nicely with the Bethe theory and other recent theoretical calculations, whereas the other one by the Kyoto group (0.3–2 MeV) appears to be about 10% low. In this comment we show that the Kyoto energy spectra can be interpreted differently, so that the deduced stopping power also agrees with the Bethe stopping power.