It's no laughing matter, repeated exposure to x-rays increases the risk of cancer and other radiatin exposure based illness. They used to use x-rays in shoe stores but had to stop due to health risks; that's why x-rays are used only when necessary.
(yes i know i am killing the fun) the reason doctors go behind some sort of booth is because they have multiple people doing these, and they cant be exposed to the radiation all the time or they die.