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As a world leader in the design and manufacture of high voltage, high-frequency x-ray generators and controllers, Gulmay also offers a fantastic range of unipolar industrial x-ray tubes. Whatever your requirements for the unipolar x-ray tubes, Gulmay has a product that will exceed your expectations.

The unipolar tubes have been designed and manufactured to withstand the demands of industrial uses such as Non-Destruction Testing (NDT) and for food testing applications. You can be confident in the quality of our x-ray tubes and know that they will perform the way you need them to, every time.

The broad range of water-cooled unipolar 225KV x-ray tubes made from metal-ceramic has been designed and brought to you from leading manufacturers. The variety available includes various target angles as well as power capabilities and focal spots.


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NDI 225/20NDI 225/21NDI 225/22NDI 226NDI 225 FB
Nominal Voltage225kV225kV225kV225kV225kV
Continuous Rating
Small Focus640 Watts640 Watts640 WattsN/AN/A
Large Focus640 Watts1600 Watts3000 Watts3000 Watts3000 Watts
Target MaterialTungstenTungstenTungstenTungstenTungsten
Target Angle20°20°20°30°30°
Maximum mA @ max kV
Small Focus2.8mA2.8mA2.5mAN/AN/A
Large Focus2.8mA7mA13mA13mA13mA
Filtration0.8mm Be0.8mm Be0.8mm Be0.8mm Be1.0mm Cu
Focal Spot Size
EN 125431.0mm x 1.0mm1.0mm x 3.0mm1.0mm x 5.5mm7.5mm7.5mm
Nominal0.4mm x 0.4mm0.4mm x 1.5mm0.4mm x 3.0mmN/AN/A
Filament Current
Small Max4.1 Amps4.1 Amps4.1 AmpsN/AN/A
Large Max4.1 Amps4.2 Amps4.2 Amps4.2 Amps4.2 Amps
Cooling MediumWaterWaterWaterWaterWater
Cooling Flow (Min)4 L/min.4 L/min.4 L/min.4 L/min.4 L/min.
Kg11kg11kg11kg11 kg11kg
Socket TypeR24R24R24R24R24


The Continuous Rating ranges from a Small Focus of 640 Watts to Large Focus of 3000 Watts and with a target angle ranging between 20 degrees and 30 degrees, with coverage ranging from 40 degrees to 90 degrees. There is also an option when it comes to Maximum mA with the Small Focus offering 2.8mA or 2.5mA and the Large Focus offering the options of 2.8mA, 7mA and 13mA, with Filtration options of 0.8mm Be or 1.00mm Cu. Filament current options are available in 4.1 Amps and 4.2 Amps depending on small or large options.

If you require unipolar x-ray tubes for inspection applications but need different imaging parameters, then we have both dual focus and single focus x-ray tubes available. These types of tubes come with small focal spots that permit for high-res imaging.

If you are looking for inherent low filtration, then Gulmay is pleased to offer x-ray tubes with Beryllium. We only supply the best quality on the market and work hard to ensure full customer satisfaction every time.

As a world leader in providing x-ray equipment, it is not surprising that you are never far from a Gulmay distributor. With distribution offices based across Africa, Asia, Australasia, Europe, North America and Canada, Gulmay has an extensive network of trained distributors who are available to provide you with genuine Gulmay equipment and maintain your equipment with Gulmay service engineers.


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