描述Comparison of dose profiles for proton v. x-ray radiotherapy.png
English: Thematic diagram showing dose as a function of depth for overlay of proton radiotherapy and x-ray radiotherapy to facilitate a comparison of the two radiotherapy methods.
This was adapted from Figure 1 of "Proton beam therapy" by W P Levin, H Kooy, J S Loeffler, and T F DeLaney, British Journal of Cancer (2005) 93, 849–854 downloaded by me from http://www.nature.com/bjc/journal/v93/n8/abs/6602754a.html.