Hey, I don't want to be a kill joy or anything, but radiation ain't a walk in the park (I'm nearly done with my course). If my PSA were 1.8 and I were 86, I'd stick with HT. You'll be on HT even if you had radiation assuming your PSA did not go to Zero. I'm on HT even with all the other stuff (radiation included) that we're throwing at the disease.
Keep it positive and smile :)