Radiation is a big part of my job, which might be why I'm so picky about it =P So I have to forget about how it works in the real world and think comic book science. 

I assume you saw this page: http://powerlisting.wikia.com/wiki/Radiation_Manipulation. I here's what we can do. You can use radiation as long as it's not ionizing (X-rays, gamma rays).
The electromagnetic pulse is fine.
Not sure how the energy blasts work, but I'll turn a blind eye. 
Heat generation could be useful. 
Radiation generation is fine if you want a reason for him to keep the suit on. Just remember that radiation does NOT kill people instantly. It takes prolonged exposure to it. 
Radiation absorption could help improve his image. "Oh, you have a toxic wasteland? I can help clean that up."
And of course radiation immunity.