X-Ray Calibration Systems

Gemini specialize in the supply of Secondary Standard Dosimetry Systems. We have designed, manufactured and commissioned a significant number of Gamma, Neutron, and X-ray Calibration Systems. As well as numerous upgrades, to both mechanical and control systems.

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Control Unit
The Exposure unit is controlled via a Windows based software system, its main features include:

• Full control of X, Y, Z and rotational axes.
• Full control of rotary neutron source cassette.
• Certificate issued for each instrument calibrated.
• In-cell control of video equipment and screen grab display of camera in top corner of monitor.
• Radiological status supplied on monitor screen; full control of warning lights, audible alarm and e-stops.

Video Systems

• Multi zoom camera lens for clear visual image of calibration instrument.
• Pan/tilt unit attached to colour camera for accurate positioning.
• Adjustable stand.
• In-cell LCD mini monitor attached to trolley.
• Controller unit situated in control room to fully control pan/tilt, zoom and focus of camera.

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X-Ray Exposure unit

The X-ray set is made up of a shielded enclosure, containing, an X-ray tube, Filter wheel, and X-ray shutter. The X-ray tube produces a beam of X-rays centred along the X axis. The filter wheel is located within the shielding for automatically selecting the different strengths of exposure. The X-ray shutter mechanism is fail-safe and will automatically drop and return to a safe position if the power is lost or one of the safety interlocks is activated.

Track & Trolley unit

• AI Alloy construction using channel, angle and ground plate.
• Precision linear rails and bearings used on X, Y and Z axes.
• X axis driven via a linear actuator using a stepper motor/gearbox arrangement.
• Y axis driven via a lead screw using a stepper motor.
• Z axis raised and lowered via a screw jack using a stepper motor/gearbox arrangement.
• The rotational axis is driven via a precision rotary table.
• Energy chain used on X and Y axes for tidy/stress free transportation of cables.
• Lengths, widths and heights can be modified to meet the requirements of the customer.

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