What are the dangers of being exposed to X-rays for a long time?

A friend of mine works in a steel factory. Because the factory has an X-ray inspection device, he is worried about radiation. Today we will briefly talk about it.
X-rays emit radiation, that’s for sure. According to the theoretical principle of X-ray, within the safe exposure dose of 100 roentgens, the working time and frequency can be determined according to this dose range.
In our daily industrial inspections, we must take safety measures in accordance with regulations, maintain a safe distance, and do a good job of protection, so there will be no problems in general.
However, it is also necessary to strictly control the continuous working time and the accumulated radiation dose within a certain period of time. Pay attention to your daily diet and physical exercise to improve your immunity.