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NEUTRON DOOR SPECIFICATIONS 

- SWING & SLIDE

DOOR & FRAME: For swing doors the frame is designed to be removable and reusable. This is an important feature as sometime in the future the current accelerator will either be replaced or have extensive refurbishment work preformed. In order to achieve this both doors and frame may need to be removed.

Our hinge design is field proven in over 45 door systems without a reported failure. Hinges are manufactured fully by RSA and use an axial cylindrical roller bearing. Both the bearings and hinge pin can be easily replaced in the field.

DOOR & FRAME FINISH: All metal surfaces sandblasted, primed and undercoated with two pack ready for finish painting by others once door system is installed.

DOOR OPENER: For hinged door the operator is a hydraulic 100 degree actuator. A small single phase pump stand with oil reservoir is located above false ceiling close to neutron door. Under normal operation the door speed for closing and opening is set for generally 10 seconds but is variable and can be set to suit the site conditions. The door opener drive is connected directly to the top hinge block eliminating drive arm protruding into door opening. For sites with minimum head clearance this allows for maximum clear opening. The drive arm is spring loaded and can be easily disconnected from the hinge block allowing for manually operation in case of the unlikely event of component failure. The operator is set so one person can push or pull the door open in an emergency, such as a power failure. Opener pressure is set so a person can stop motion easily by holding onto door.

For slide door the operator is pneumatic with air supply either Hospital's air or air compressor supplied with system. All other functions remain the same as for swing type door system.
Above: Neutron door used for high energy shielding utilising floor safety mats as collision protection
CONTROL STATIONS: Normally three door stations are supplied, each with OPEN, CLOSE and as required STOP buttons. Location both sides of door and near accelerator control console. Door position status lights to be located near accelerator console if door not able to be seen from control area.

Door operation is as follows:

Momentary press of either open or close buttons will initiate the open or close cycle. If fitted with STOP function door can be stopped during close or open cycle. Depending on type of collision protection used and safety circuitry door may be inhibited until obstacle cleared.

COLLISION PROTECTION: As the neutron doors can weigh in excess of 1000Kgs it is essential that collision protection be incorporated to prevent harm to human or material objects. We have investigated a wide range of collision systems and have settled on the floor pressure mats as our primary system. Mats are placed on both sides of the door so as to prevent personnel from getting close enough to be injured. If the door is in motion and if any of the mats is activated the door will stop. Once the activating pressure is removed pressing either the CLOSE or OPEN button will reactivate the door. Control circuitry is incorporated so that either open/close or only close cycle is affected by the collision protection system. The feature is set on site by customer decision. Mats have been in operation since the mid 1980's and have proven to be the most reliable system.

In an emergency situation (accelerator power off) the door is programmed to open and remain open until power is returned to the accelerator. A 24VDC source is required from the accelerator for this feature.

DOOR INTERLOCKING: Door(s) will be interlocked so that accelerator cannot be turned on in high x-ray mode unless the door is fully closed. Interlocking is through an industrial grade micro switch mounted within the door frame and does not protrude in the clear opening. Connection of the interlock to the accelerator is by others.

Radiation Services Group design, manufacture and install.

Major shielding doors. Major projects have included:
  1. Australian Custom X-ray Container Scan Halls, Sydney, Melbourne and Brisbane. Pneumatic sliding door sets located each end of building with collision protection. Door set weight 4 tonnes.


  2. Royal Prince Alfred Hospital, Sydney. Two 18mv photoneutron doors, automatic operated swing doors with collision protection, door weight 1200kgs.


  3. Hong Kong Sanitorium Hospital.Pneumatic sliding 18Mv photoneutron door with collision protection. Door weight 3 tonnes.


  4. Franco Vietnames Hospital, Ho Chi Minh City. 15mv Photoneutron door, automatically operated swing door with collision protection. Door weight 1,000kg.

  5. Epworth Hospital, Melbourne. Two 25mv photoneutron doors, automatic operated swing doors with collision protection. Door weight 1200kg.

    6.
Above: Map of neutron door sites