Based on over 70 years experience we have designed, manufactured and successfully installed a vast number of these power operated doorsets worldwide. In many instances the shielding is also extended to walls, ceilings and floors. Installations have been completed for numerous high energy medical diagnostic and treatment rooms
Similar designs have also been used on many industrial sites where the facilities involve Non-Destructive Testing.
This total shielding package can include a complete survey by our Radiation Protection Advisor to calculate the necessary lead thickness for each individual site. This will be based on local site conditions and working practices to ensure maximum safety in the most cost effective manner. Currently, the record for the maximum lead thickness for a door installation is 240mm!
The construction techniques are different from those used in standard diagnostic applications.
As always special attention is paid to the integrity of the overall shielding to the structural opening. Lead lined door frames or linings are fitted within the door openings with particular attention to shielding across the door threshold. This takes into consideration the need for easy trolley access and cleaning, particularly in medical applications.
Doors are manufactured using a tubular steel framework. Lead is fitted to both faces of the door to provide and easy and balanced movement. Doors are supported on heavy duty pivots or high capacity sliding door gear. Any specified paint, veneer or plastic laminate finish is available.
Power operation is provided for all types of doors, complete with all necessary safety systems to meet specific site requirements and local regulations.
Recent Sites Include:
- RAS Laffan, Qatar
- CyberKnife® Centre, Harley Street Clinic, London
- Wolfson Institute, Hammersmith Hospital, London
- NPL, Teddington
- Edinburgh Cancer Centre
- Freeman Hospital, Newcastle
- Mount Vernon Hospital, Middlesex
- Aberdeen Royal Infirmary
This is an example of a purpose built facility at the National Physical Laboratory project in Teddington, UK.
This project involved the construction of 16 power operated lead lined doors complete with safety systems and all necessary interlocks. The shielding ranged from 7.5mm to 160mm of lead, the latter in a door weighing 10 tonnes. Similar lead thicknesses were used to construct ducts to shield apertures for services in the ceiling, all suitably supported in a steel framework.
The contract involved undertaking all necessary calculations of the lead shielding requirements for the doors together with concrete thickness and appropriate densities for the walls and ceilings.
CyberKnife® Centre, Harley Street Clinic, LondonTop
This project consisted of a room with lead lining to walls and ceiling ranging from 15mm to 290mm thickness. The door is fitted with interlocking lead chevron bricks to a total thickness of 240mm and weighs over 18 tonnes.
All shielding calculations and testing were undertaken by our Radiation Protection Advisor.Read More: The UK's First CyberKnife®
RAS Laffan, QatarTop
A recent contract for The Nakilat Ship Repair Yard, RAS Laffan in Qatar is another illustration of our ability to design, manufacture and commission highly specialised installations, meeting the very specific requirements of our individual clients.
The challenge was to provide the total shielding to the door opening of an external building, built on an area of desert reclaimed from the sea. All exterior surfaces and components are fully protected from damage by salt water and sand.
It initially involved our own Radiation Protection Advisor (RPA) who was commissioned to identify the shielding requirements for this contract, based on the use within the room of a high energy radio-active source of Iridium 192
A pair of doors each 4.6 metres high x 3.6 metres wide were constructed from a steel supporting framework produced in our North of England factory. This accommodated layers of interlocking lead bricks to a total thickness of 80mm. With the external faces and edges clad in steel each door weighed in excess of 22 tonnes!.
As this facility was located in an area with extreme weather conditions, a special purpose paint finish was specified by the client.
Each door was supported on special heavy duty wheel boxes running on a track. This was recessed into a special trench 600mm deep and retained with suitable top supports, all enclosed within a weather proof pelmet.
The doors were power operated by two heavy duty Hydrovane compressors. They were fitted with an emergency backup facility in the event of power failure, complete with all necessary safety systems, warnings lights, and alarms.
The vast size of the structural opening was required to accommodate large haulage vehicles. The size of the floor trench made it necessary to provide heavy duty plates to cover the trench and track. The plates linked to the power operating system automatically raising and lowering them as the doors were opened and closed.
To achieve a total shielding to the opening, linings of lead bricks of a similar thickness to the doors were also fitted to the jambs and head of the structural opening and recessed into the floor.
On completion, our Radiation Protection Advisor (RPA) in conjunction with our Client, conducted the final testing and commissioning of the facility.
Wolfson Institute, Hammersmith Hospital, LondonTop
We provided a complete suite of sliding, single and double pivoted doorsets. All doors were lined with 22mm of lead, fitted with lead glass observation windows, power operated and complete with all necessary safety sensors.
A special 22mm lead lined 'pass through' hatch which formed part of our overall shielding contract, is an excellent example of our versatile manufacturing capabilities.