I started as an electronics/computer tech. Eight years in field service. Then I got a job offer from Stanford Linear Accelerator Center.
I fell into the radiation field by accident which uses high voltage and control circuits for most radiation detection devices.
Needed more education. So back to school. I was a one man calibration department. Also did some calibration for Lo Alamos. Designed portable Gamma/Neutron mobile stations and peripheral monitoring stations. That would of never happened if I didn't go back to school. SLAC flew me to different locations like Boulder, Co. (Rocky Flats) and Las Vegas (UNLV) to learn the latest and greatest. I did some work that ended-up being used by our government. I signed a non-disclosure agreement so I will never see a penny or get any kudos for the work. That's cool, I feel like I did my part. ;)
Radiation techs make ~$30.00 and hour. If you've past the NRRPT even more. http://www.nrrpt.org/ I made a little more for the work I did.
http://www.nukeworker.com/
Jeff