Philips X-ray Tube Disassembly - Tháo gỡ ống tia X của Philips- Nguyễn Công Trình
X-ray Tubes & X-ray Tube Assemblies
Tubes for Mobile C-Arms, Mobile X-Ray Systems and Dental Applications
Stationary anodes, operation in single tanks
| Tube Name | Appl. | Focal spot size | Nominal Voltage | Nominal power | Anode angle | Anode heat storage capacity | Max. heat dissipation |
|---|---|---|---|---|---|---|---|
| SR 90 series | dental | 0.5 | 90 kV | 1.65 kW | 5.5° | 26 kJ (35.1 kHU) | 200 W |
| SR 120/ 15/60 | dental CBCT Rad, Fluoro | 0.5/1.5 | 120 kV | 0.68/ 3.2 kW | 16° | 35.5 kJ (48 kHU) | 600 W |
| SR 125/ 40/80 | 0.6/ 1.01 | 125 kV | 2.1/ 4.0 kW | 9° | 60 kJ (81 kHU) | 600 W |
The major drawback of solid-anode microfocus X-ray tubes is the very low power they operate at. In order to avoid melting of the anode the electron-beam power density must be below a maximum value. This value is somewhere in the range 0.4-0.8 W/µm depending on the anode material.[2] This means that a solid-anode microfocus source with a 10 µm electron-beam focus can operate at a power in the range 4-8 W.
In metal-jet-anode microfocus X-ray tubes the solid metal anode is replaced with a jet of liquid metal, which acts as the electron-beam target. The advantage of the metal-jet anode is that the maximum electron-beam power density is significantly increased. Values in the range 3-6 W/µm have been reported for different anode materials (gallium and tin).[3][4] In the case with a 10 µm electron-beam focus a metal-jet-anode microfocus X-ray source may operate at 30-60 W.
The major benefit of the increased power density level for the metal-jet X-ray tube is the possibility to operate with a smaller focal spot, say 5 µm, to increase image resolution and at the same time acquire the image faster, since the power is higher (15-30 W) than for solid-anode tubes with 10 µm focal spots.
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