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. Author manuscript; available in PMC: 2016 Apr 21.
Published in final edited form as: Phys Med Biol. 2015 Mar 24;60(8):R155–R209. doi: 10.1088/0031-9155/60/8/R155

Figure 14.

Figure 14

Absorbed dose D as a function of depth z in water from a spread-out proton Bragg peak (SOBP). Various locations and regions that are indicated on the plot are defined in the text. This peak was measured with a Markus-type parallel-plate ionization chamber in the Northeast Proton Therapy Center (NPTC) gantry. The measured data are plotted with open circles and the model-fit as a solid line. Note that the electronic buildup region, which spans only a few millimeters, is not visible in this plot.