Yins guys answers are totally in line with my experiences, except this last one. One time, I had the tech tell me that my dose was a result of the applied voltage, so I told him I could get that formula and to let me know the what he used. He got real flustered and said he didn't have that number handy.😳 Which is why I found this last conversation so nice. Although, her first responses were the numbers, so I had to ask about the units. That popped her eyes wide and she was back into the operator shack scanning her computer. Came back with the my units and a remark that having to deal with units like that took her back to XRay Tech classes!