When a healthcare facility installs an X-ray machine in the UAE, one of the first questions that arises is: how much lead lining does the room need? The answer depends on a combination of factors — the type of equipment, its radiation output, the workload, the construction of the existing walls, and critically, what is in the adjacent rooms, corridors and spaces above and below. Getting this wrong in either direction is costly: too little shielding means failing the FANR inspection and being unable to obtain your operating licence; too much shielding means unnecessary construction cost. This article explains exactly how lead lining requirements are determined in the UAE.
Lead is the material of choice for X-ray room shielding because of its exceptionally high atomic number (82) and density (11.3 g/cm³). These properties make lead highly efficient at absorbing X-ray photons through photoelectric absorption and Compton scattering. A 1mm sheet of lead provides the same shielding as approximately 8cm of standard concrete or 120cm of water — making lead practical for installation in clinical buildings where structural thickness is limited.
In UAE healthcare construction, lead shielding is typically supplied in sheet form — 1mm, 1.5mm, 2mm or 3mm thick — fixed to the inner face of walls, floors and ceilings using lead-specific adhesive and mechanical fixings, then overplastered or overboarded to provide a smooth finish.
Lead thickness for an X-ray room is calculated by a qualified medical physicist using a formal radiation shielding design methodology. In the UAE, FANR accepts calculations performed according to NCRP Report 151 (Structural Shielding Design for Medical X-Ray Imaging Facilities), which is the international gold standard for this work.
The calculation considers: • Primary radiation — the direct beam aimed at the patient and striking the primary barrier (typically the wall behind the detector) • Secondary radiation — scatter from the patient and leakage from the X-ray tube housing • The workload (W) — the total radiation output per week in mA.min • The use factor (U) — the fraction of the workload directed at each primary barrier • The occupancy factor (T) — the fraction of the working week that an individual is in the adjacent area • The design dose limit — FANR specifies 1 mSv/year for uncontrolled areas (public) and 5 mSv/year for controlled areas (radiation workers)
These are the typical lead thicknesses specified for different room types. Your specific values will depend on the calculation for your facility — never use these figures without a site-specific calculation:
Dental periapical X-ray: 1 – 1.5 mm Pb for walls adjacent to occupied areas Dental OPG (panoramic): 1 – 1.5 mm Pb Dental CBCT: 1.5 – 2 mm Pb (higher output than conventional dental X-ray) General X-ray room: 1.5 – 2 mm Pb primary barriers; 1 mm Pb secondary barriers Fluoroscopy room: 2 – 2.5 mm Pb (higher workload than static X-ray) Mammography: 0.5 – 1 mm Pb (lower kVp, lower output) CT scanner (up to 64-slice): 2 – 3 mm Pb primary CT scanner (128-slice, high workload): 3 – 4 mm Pb primary
Control room viewing windows in X-ray rooms require lead glass — a transparent material incorporating lead oxide that provides radiation shielding equivalent to the surrounding wall. In UAE practice, the typical specification is 1.5 – 2 mm Pb equivalent for dental and general X-ray control windows, and 2 – 2.5 mm Pb equivalent for CT and fluoroscopy control room windows.
Lead glass is available in standard sizes and can be custom-cut. It must be installed within a lead-lined frame that eliminates gaps at the edges — a common installation defect that creates a radiation weak-point at the window perimeter.
The entry door to an X-ray room is a primary or secondary barrier depending on its position relative to the beam. In most configurations, the door is a secondary barrier and requires 1 – 1.5 mm Pb lining. The door frame must also be lead-lined to eliminate the gap between door and frame — another frequent installation defect. Lead-lined doors are heavier than standard doors and require appropriate hinges and frame fixings. RevirzaMed supplies and installs lead-lined door assemblies complete with frame lining.
After lead lining installation is complete and before any clinical use begins, a radiation leakage survey must be performed by a medical physicist. This survey uses a calibrated radiation survey meter to measure dose rates at all surfaces of the X-ray room — walls, floor, ceiling, door, window, service penetrations — to verify that radiation levels outside the shielded room comply with FANR dose limits.
If the survey finds any area exceeding the limit, additional lead must be applied to that area before the room can be commissioned. RevirzaMed performs post-construction radiation surveys and issues a written compliance certificate, which is required for the FANR licence application.
The most frequent lead lining installation defects found during radiation surveys:
• Gaps at wall/floor and wall/ceiling junctions — lead sheets must overlap by at least 20mm at every junction • Pipe and conduit penetrations not sealed — every electrical conduit, water pipe and drain passing through a shielded wall must be wrapped in lead and sealed • Lead sheets fixed too far apart — adjacent sheets must butt tightly with no gaps; staggered joints with at least 10mm overlap • Window frame edges unsealed — lead glass must bed into a continuous lead frame with no air gap • Door frame gaps — the gap between door leaf and frame must be protected by lead rebates on the frame
No. Only barriers receiving primary or significant secondary radiation require lead lining. The medical physicist's shielding calculation identifies which specific barriers require lead and specifies the required thickness for each. Walls that only receive very low levels of scattered radiation may comply without lead.
Yes. RevirzaMed installs lead lining in both new-build and existing rooms. In existing rooms, lead sheets are fixed to the inner face of existing walls and overboarded. The room must typically be taken out of clinical use during installation.
A standard dental X-ray room can be lead-lined in 1–2 days. A full CT suite installation typically takes 3–5 days. Duration depends on room size, number of barriers requiring lead, and access constraints.
RevirzaMed Healthcare Solutions — Abu Dhabi's trusted FANR Approval and medical equipment specialists since 2015.