There have been many Nuke Med techs that have made the transition to Radiation Protection, some to Chemistry. Look over some of the job postings in those areas. You will need to start at entry level unless some of your experience is closely related - rad mat'l control, exposure control, etc. Good luck. After you have looks around a bit, feel free to ask some more specific questions.
Welcome to nukeworker. 
What Housedad said and that should include taking a moment to properly ascertain the exact daily procedure from Nuclear Medicine Technology field. Did you do surveys of the pigs and ammo cans? Did you verify the half life calculations as supplied by the nuclear pharmacy? What about your experience with thin layer chromatography? All of those hands-on daily duties have applications in the big leagues of nuclear energy. No, there is no cut and dried job to step right into, trust me on that one, but if you can read a meter, display a positive can-do attitude, and are willing to stay the course, it will happen for you.
Homework time: study for the poss/mass tests now, not later.
and learn to use the emoticons, or so I am told...
