It's not done everywhere, and only in experienced places or rather should be. I had a newer type, similar to brachytherapy, called HD-IORT, High Dose Rate Intraoperstive Radiation Therapy. What type question do you have? There are several types of brachytherapy, Low Dose Rate, LDR, High Dose Rate, and are sometimes used as a boost dose with IMRT. Several members here had Brachtherapy, who may be able to answer your questions better.
Good luck.