Hi Kim,
I am so sorry to hear of your cancer coming back. Your docs will know what type of radiation is best suited to your disease. Not every type of radiation has maximum efficiency for every type of tumor, so I would ask them very specifically what they think would be best in your case. I asked my Doc about implant radiation or brachytherapy, and he told me it could be done, of course, but that he didn't think it would be suitable for what I had, which was a SCC of the lateral tongue. He set me up with a radiation oncologist, (whom I will be seeing Tuesday afternoon) so that we could discuss available options and treatment modalities that would be best suited to my personal case. My opinion is that you need to talk to them and see what they have to offer, and if it is not agressive enough to suit you, get another opinion!
Andrea