...I am so sorry you are facing treatment. Radiation isn't something I am versed in, but we do have a moderator who might be able to better answer your questions. I have tagged Rachel so she will see your post.
I am including one of Rachel's articles. I am hoping it might help answer some of your questions.
https://skincancer.net/life-with-skin-cancer/what-superficial-radiation-therapy
Please keep us posted on your decision and progress! We are here for you!
April, SkinCancer.net, Moderator