Product Information

PIX-RAY TUBE
DF-281
Stationary Anode X-ray Tube
General DataElectrical:
Circuit:High Voltage Generator ............................................... Constant Potential High-Voltage Generator
Grounding ............................................................................................................. Center grounded
Nominal X-ray Tube Voltage .................................................................................................... 125 kV
Nominal Focal Spot Value:
Large Focus ............................................................................................................................... 2.8
Small Focus ................................................................................................................................ 0.6
Nominal Anode Input Power (at 1.0s):
Large Focus ........................................................................................................................ 1750 W
Small Focus ........................................................................................................................... 560 W
Nominal Radiographic Anode Input Power:
Large Focus ........................................................................................................................ 8000 W
Small Focus ........................................................................................................................... 600 W
Exposure Duty Cycle:
Large Focus ............................................................................................................................. 1:60
Small Focus .............................................................................................................................. 1:60
(Exposure Time : Interval Time)

Mechanical:
Dimensions:Overall Length ........................................................................................... See dimensional outline
Maximum Diameter ................................................................................... See dimensional outline
Target:Anode Angle .................................................................................................................. 15 degrees
Material ............................................................................................................................. Tungsten
Inherent Filtration ..................................................................................... At least 0.8 mm Al at 75 kV
X-ray Coverage .................................................................................... 400 ×400 mm at SID 900 mm
Weight: .......................................................................................................................... Approx. 450 gCooling Method ............................................... Oil immersed (60℃ Max.) and convection oil cooling.
Tube Holding .................................... Holding the glass envelope of the anode end and cathode end,or the screw of the anode shank.
★The information contained herein is presented only as a guide for the application of our products. No responsibility is assumed by Canon Electron Tubes& Devices Co., Ltd. (CETD) for any infringements of patents or other rights of the third parties which may result from its use.
No license is granted by implication or otherwise under any patent or patent rights of CETD or others.
★The information contained herein may be changed without prior notice. It is therefore, advisable to contact to CETD before processing with the design ofequipment incorporating this product.

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Absolute Maximum and Minimum Ratings(At any time, these values must not be exceeded)
Maximum X-ray Tube Voltage .................................................................................................. 125 kV
Between Anode (or Cathode) and Ground .............................................................................. 62.5 kV
Minimum X-ray Tube Voltage ..................................................................................................... 40 kV
Maximum X-ray Tube Current:
Large Focus ........................................................................................................................ 100 mA
Small Focus ........................................................................................................................... 15 mA
Maximum Filament Current:
Large Focus ............................................................................................................................ 4.6 A
Small Focus ............................................................................................................................. 3.2 A
Filament Voltage (At maximum filament current):
Large Focus ..................................................................................................................... 6.0~8.3 V
Small Focus ...................................................................................................................... 3.4~4.7 V
Filament Frequency Limits ............................................................ DC or AC (Sine Wave) 0 ~ 20 kHz
Thermal Characteristics: (As shown in Fig.4)
Anode Heat Content ............................................................................................................... 28 kJ
Maximum Anode Heat Dissipation Rate ................................................................................ 265 W
Maximum Radiographic Exposure Time ...................................................................................... 10 s

Environmental Limits
Operating Limits (in dielectric oil):
Oil Temperature ............................................................................................................... 10 ~ 60℃
Oil pressure ................................................................................................................ 70 ~ 140 kPa
Shipping and Storage Limits:
Temperature ................................................................................................................... -40 ~ 70℃
Humidity .......................................................................................................................... 10 ~ 90 %(No condensation)
Atmospheric Pressure ................................................................................................ 50 ~ 106 kPa-2-

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Maximum Rating Charts(Absolute Maximum Rating Charts)
Constant Potential High-Voltage Generator
Nominal Focal Spot Value: 2.8

Nominal Focal Spot Value: 0.6
15TUBE CURRENT [mA]40kV

50kV

1060kV
70kV
80kV
90kV
100kV
110kV
125kV

500.1

1
EXPOSURE TIME [s]-3-10DF-281

Filament & Emission Characteristics
Constant Potential High-Voltage Generator
Nominal Focal Spot Value: 2.8

This graph indicates typical characteristics.

Nominal Focal Spot Value: 0.6

This graph indicates typical characteristics.

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Anode Heating / Cooling Curve
28265W

HEAT STORAGE [kJ]

2520150W
1510COOLING
5HEATING
00369TIME [min]-5-1215

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Dimensional Outline
Unit: mm

M5 10DEEP15°

Φ52 max.

139 ±2.5

65 ±1.55O 16

CENTRAL X-RAYKL(O4)20.

16 max.

FOCAL SPOTC

SHORT PINSN

L ： LARGE FOCUS
S ： SMALL FOCUS
C ： COMMON
K ： CATHODE
N ： NOT FOR USE

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Tel: +81-287-26-6666
Fax: +81-287-26-6060
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Product scope is referred to the following URL. https://etd.canon/eng/company/quality.htm.

PE-DF-281 2018-11