A lead door for an X-ray room is part of the shielding envelope, not a stand-alone product, and the same is true of the lead glass observation window. If either is under-specified or poorly installed, it becomes the weak point in an otherwise correct room. This guide explains lead equivalence, how to choose door type and size, what to look for in lead glass, and how doors link to interlocks and warning lights.
Lead equivalence: the starting point for door and glass
Shielding is specified as lead equivalence, usually in millimetres of lead (mm Pb), for a given beam quality. The required value for each wall, door and window comes from the radiation protection assessment, which considers the equipment, workload, occupancy of neighbouring areas and distance. It is not a number to copy from another project.
Ask the physicist or consultant for the required lead equivalence of the door and the window separately from the walls, and require the manufacturer to state the lead equivalence of the supplied product and the test basis.
Choosing an X-ray room door
The usual options are swing doors, sliding doors and automatic sliding doors. Swing doors are simple but need clear floor space and strong hinges because lead is heavy. Sliding doors save space and are often chosen in tight corridors; automatic versions help when patients arrive on beds or wheelchairs and staff have their hands full. Whatever the type, the lead lining must be continuous across the leaf, and the frame, edges and overlap to the wall need equivalent protection so that radiation cannot pass through gaps.
Check the clear opening: standard stretchers and wheelchairs must pass easily. Confirm the door's weight limit for the wall, the finish and fire and acoustic needs, and the operating mechanism for emergency opening.
Lead glass for the X-ray room observation window
Lead glass gives the radiographer a view of the patient from the control area. It must provide at least the same lead equivalence as the wall around it, and the frame must be shielded too. Check the size so that the operator can see the whole patient position, the height relative to the control desk and the optical clarity: good lead glass should show a clear, undistorted view, with no visible defects or discolouration.
Ask for the lead equivalence certificate and the glass dimensions. Protect the glass from scratches and impact during construction, and do not cut or drill it on site.
Interlocks, warning lights and daily safety
The door is often connected to a door switch, an X-ray-on warning light and sometimes an exposure interlock, so the beam cannot be released with the door open. Agree the logic with your physicist, the equipment supplier and the electrical contractor before installation. Read our guidance on X-ray room warning signs and lights for placement and signage.
Make sure there is a way out of the room in an emergency and that automatic doors can be opened manually. Include the doors and window in the periodic safety checks described in X-ray quality control tests.
Installation, verification and budgeting
The installer must match the lead lining of the walls, the frame and any penetrations such as electrical boxes. After installation, a qualified expert should carry out a radiation survey to confirm that the shielding performs as designed. For wider context, read X-ray room shielding, X-ray room design requirements and X-ray room cost.
Beckfinity specialists can coordinate door and glass requirements with the X-ray equipment layout for a new room.
Frequently asked questions
What lead thickness should an X-ray room door have?
It is set by the radiation protection assessment for your equipment and workload, expressed as lead equivalence. Do not copy a value from another project.
Does lead glass need the same protection as the wall?
It must provide at least the same lead equivalence as the surrounding wall, and the frame must be shielded as well.
Should the door be automatic?
Automatic sliding doors help with beds and wheelchairs, but they need an emergency manual opening and proper interlock design.
Who verifies the shielding?
A qualified radiation protection expert should survey the finished room before clinical use.
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