I remember how red my husband's neck got during radiation. They say you can also use a clear aloe ...the kind without anything added to it. My husband's skin on his neck was so sore that we cut the neck band off some of his t-shirts so it wouldn't hurt as much when wearing a shirt.
Some burns are so bad that they have to stop radiation for few days/weeks for the burns to heal a little. It's best not to stop the radiation.