Calculations of electronic stopping cross sections for low-energy protons w
ere performed using available interaction cross sections and information on
the mean energy loss per collision. The results were compared with publish
ed stopping power data to assess the general consistency and reliability of
the results. The calculated stopping cross sections include contributions
from excitation by both the proton and neutral-hydrogen components of the c
harge-equilibrated beam and the mean energy lost per interaction. The calcu
lated electronic stopping cross sections for swift charge-equilibrated hydr
ogen particles in water are in agreement with previous tabulations of stopp
ing power to within 20% (approx.) for particles energies less than 0.3 MeV.
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