I do not need to have radiation at this time, yay.
The longer story: radiation doc explained that radiation decreases probability of recurrence by 50%. So, also, does tamoxifen. He guestimates I have 6% or less chance of recurrence right this minute, with surgery only. Radiation would knock it to 3%, and tamoxifen would make it 1.5%. Hell, I could have been comfortable with the 6%. So I decided to forego radiation. I have to have mammograms fairly regularly now anyway. If there is a recurrence, they will find it sooner than later.