That's dangerous stuff there! The radiotherapy department has some Cobalt 60 units and a linear accelerator, but these are fixed units built into lead 'bunkers'. The mobile stuff is scary. A mate of mine was doing industrial radiography and he had to carry a mobile unit through some pipes at a refinery, to X-ray the welds for defects. He stopped doing that job when he learned that a colleague had found a defective unit had 'lost its source' :-o
Nah, I'll stick to the more friendly radiation, thank you.