X‑ray rooms should be of a size that allows unimpeded access and ease of movement around the equipment, the patient table and the operator’s console. The size of the room will vary greatly depending on the modality, workload, distance to boundaries, beam directions, boundary materials and occupancy of adjoining areas whether there is existing shielding or not.
For this reason there is no a specific norm for the size of any X-ray room, but it may be helpful to bear in mind that in a typical use of a dental X-ray machine with a workload of 20 films per week or less, no structural shielding is required if the distance between the patient and the wall or other boundary is at least two metres.
Extra-oral X-ray equipment and combined equipment suites must be located in a dedicated X‑ray room. An area of 12 square metres will be sufficient for panoramic radiography equipment such as orthopantomogram units.
A slightly larger area will comfortably accommodate the widely used combination of panoramic and intra-oral equipment. An alternative solution is to locate the exposure hand switch(es) outside the X‑ray room door and install a shielded lead glass viewing panel in the door; a 1mm lead equivalence will often suffice. Nevertheless, the overall level of shielding will always depend on the workload, room geometry and use/occupancy of adjoining areas.