X-ray machines do not emit radiation when they are not in use, provided that they are properly maintained and not malfunctioning. X-ray machines are designed with safety measures to ensure that radiation is only emitted when intentionally activated for diagnostic or therapeutic purposes.
Modern X-ray machines have mechanisms such as shielding and collimation to focus and control the X-ray beam. These machines typically have a safety interlock system that prevents X-rays from being emitted when the machine is not actively in use or when it is in a standby mode.
However, it is important to note that X-ray machines should be regularly inspected, maintained, and calibrated by qualified professionals to ensure their proper functioning and safety. Periodic radiation safety checks are conducted to verify that the X-ray machine is emitting the intended levels of radiation and that no radiation leakage is occurring.
In summary, as long as X-ray machines are functioning correctly and have undergone proper maintenance and inspections, they should not emit radiation when they are not actively being used for imaging or treatment.