Figure 4
From: Medium-thickness-dependent proton dosimetry for radiobiological experiments

Variations of (a) calibration coefficient R and (b) average R with medium thickness in the cell cytoplasm, and variations of (c) R and (d) average R with medium thickness in the cell nucleus, for different incident proton energies. (The lines connecting the points do not represent data and are only presented to help the eye). (Note: error bars are smaller than the symbols).