I had a left mastectomy on 4/1/21 and, after healing from surgery, had 16 PROTON BEAM radiation treatments at MN Mayo. Proton radiation is the safest form of radiation because the protons release all of the energy at the target and nowhere else. I had 4-5 weeks of sunburn and used Vanicream twice each day. No skin peeling, no damage to heart or lungs, etc. Toward the last few treatments, I experienced some fatigue cured by afternoon naps. My radiation treated the entire upper portion of my let chest, the armpit and the underside of my left arm from the axilla to the elbow. I had no other problems. Don't hesitate to choose proton radiation. It's the safest and most effective!!! I am 84+ and doing fine.