I'm going through Proton radiation right now. I will receive 15 treatments. Last night I finished treatment number four. The treatments are painless. They move the beam so it aims at you in two directions. One from the top and one from side diagonally. The machine sounds like the magnets are scraping the tracks as the beam moves a line across you. The machine is open sided so you don't get claustrophobic. So far I have not experienced any sunburn or tireness. They tell me that will probably happen in my second week. I am using Mometasone Furoate cream morning and night to prevent skin damage and vanicreme in between.