They wear 30lb lead aprons. On a practical note, it's back strain from having that thing on 10-12h a day.
But my point on low radiation is that you are not behind a lead wall. Below knees, arms, head are exposed. Depending on the design the seams between sections of the protective gear will also leak. And the protective gear gets tested but only periodically not before every use.
All in all everything seems to align with some probability of prolongued low radiation exposure much like nuclear power plant staff.