Mike
Hey, if you don't ask questions, you can't learn. One of the great things about the OCF forum is finding out stuff. The only way to know your radiation dosage is to ask your RO. Each patient gets an individually tailored radiation field and you can't calculate dosage just from the TX number.
I had weekly meetings with my RO and he would go over how many Gy I got that week. It would vary by day. I got an average of just shy of 2 Gy a day for the IMRT with 40 TX for 72 Gy total. With the cyberknife it was 5 Gy a day for 5 TX for 25 Gy total. And since I had 97 Gy and am still here posting, it's obviously not a "limit: or the "maximum." although as I mentioned, people used to think so.
I know you are worried about a possible recurrence, but after three years you are on the right side of the statistics. Even if God forbid, it came back you could still be treated. We have lots of members in the recurrence club (NO, we are not looking for new members) who are still going strong.
Your radiation dosage is not some urgent information you need, at this point it's academic, so you could email or write your RO. If you are still seeing a follow up doctor, he or she could also access that information for you.
Keep the Faith
Charm