Particle Incident Max. range LET at cell LET at cell LET at cell Volume Energy in water entrance middle exit averaged MeV microns LET keV/m keV/m keV/m keV/m H+ 2 77.7 16.4 17.7 18.4 17.6 He+ 4 37.3 116 122.6 132.9 123 Contributions to the dose uncertainty. Table 2 Average number Standard Dose uncertainty Dose uncertainty Dose Uncertainty of particles per deviation of contribution due contribution due due to Flux cell particles to Poisson to volume variation (5%) assuming statistics average LET Poisson variation distribution unit Particles Particles Gy Gy Gy Average dose (Gy) Protons Alphas Protons Alphas Protons Alphas Protons Alphas Protons Alphas 0.5 2 1.41 0.35 0.004 0.03 1 28 4 5.52 1.85 0.20 0.46 0.003 0.008 0.05 0.05
Particle Incident Energy MeV Max. range in water microns LET at cell entrance keV/m LET at cell middle keV/m LET at cell exit keV/m Volume averaged LET keV/m H+ 2 77.7 16.4 17.7 18.4 17.6 He+ 4 37.3 116 122.6 132.9 123 Table 2 Contributions to the dose uncertainty. Average number of particles per cell Standard deviation of particles assuming Poisson distribution Dose uncertainty contribution due to Poisson statistics Dose uncertainty contribution due to volume average LET variation Dose Uncertainty due to Flux variation (5%) unit Particles Particles Gy Gy Gy Average dose (Gy) Protons Alphas Protons Alphas Protons Alphas Protons Alphas Protons Alphas 0.5 2 1.41 0.35 0.004 0.03 1 28 4 5.52 1.85 0.20 0.46 0.003 0.008 0.05 0.05
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