I know this is an old thread but I am a radiation oncology nurse. It all depends on what cancer dx you are working with. I work with Breast cancer, gyn, lung and esophagus. I do the most skills with my endometrial and cervical cancer patients. We do procedures such as lady partsl cylinders and tandem & ring. This is considered Brachytherapy. The patients having tandem & ring are done under anesthesia the entire time which is about 3 hours. I get the patient ready starting IV access, giving pre procedure meds and then when the patient is asleep I place a foley catheter. I assist with positioning and am with the patient the entire time through post op recovery. I actually use many of my skills in this position. You really get to know your patients in radiation oncology. It is a very satisfying job.