Our radiation exposure is, by far, greatest from intraoperative fluoroscopy. Particularly when it's a case the you called for fluoroscopy half-way through and didn't want to rescrub, or just forgot the lead in the first place. Bad news for you... particularly your thyroid. Don't forget the thyroid shield. I have thought about lead-lined glasses. But I think these are expensive and will likely be an investment when I'm an attending.
felipe5 is correct. You're more likely to be heavy on the pedal earlier in your career. I'm sure I burned by nutsack off as a PGY2. Remember, the C-arm delivers radiation from the bottom, not the top. And we are VERY close to the beam.
As far as brachy seeds go... they all have half-lives... you just need to know the element that was used and look it up.
At my institution, we do brachy with the rad onc staff. We do preop US to map the NVB, then do needle placement. Rad Onc places the seeds. Then we cysto after.
More to come... lunch time.