Hi. I'm Aliza, a BC patient and the site's unofficial Medical Librarian. I'm replying to your question not because I have the answer, but because Cancer is so prevalent in my family (except for BC) with Colon Cancer being the most prevalent (my late Grandfather and his 3 siblings [my grandfather would be 113 if he were alive today, so don't feel bad...;)]).
I've given your question a great deal of thought-because of my background and training (I have a Master's in Library Science with a concentration in Medicine and I've worked in several medical libraries). I look at questions in a different way than other folks on the site do?
My best response to you would be to ask you if you've spoken to your Radiation Oncologist? She/he is the best person to speak with to gain this information from.
I understand that you're seeking someone who's been through the same procedure, but just wanted to be sure that you didn't leave that stone unturned.
Because of my so-prevalent family history, I've been screened for colon cancer starting at age 40, rather than 50 (the G.I. doc overheard me talking when I brought a friend in). So far so good at least as that's concerned. As far as what I have is concerned, I'm doing very well.
I hope your radiation goes smoothly and painlessly and I hope you find someone from your community to give you the answer your seeking.