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An x-ray generator is the device that supplies electric power to the x-ray tube. The x-ray generators modifies the electric supply to the needs of the x-ray tubes. The x-rays tubes need electric supply for two reasons.
- To boil out the electrons from the filament
- To accelerate these electrons towards anode to produce x-rays.
Thus x-ray generators must have two basic electric sections and circuits to supply the electric energy to filament and to electrodes, they are called filament circuit and high voltage circuit.
Also most of the generators include a third circuit for the timer, which control the time of exposure to take an image.
The mechanism of the generator is , it have two main parts, a control panel or console and a transformer assembly. The control panel allows the operator to select appropriate Kvp,mA, and the exposure time for a particular radiographic examination. There is some suitable metering on the console to indicate the selection and actual values of all parameters. There are a button with two levels, one start the heating of filament and other start the exposure.
The other part of x-ray is transformer assembly which is a grounded metal box filled with oil. It contains a low voltage transformer for filament and a high voltage transformer for the high voltages. An important part of this section is a group of rectifiers for the high voltage circuit. The potential difference in these circuit may be in the range of 150,000V. Due to this high level of voltages, the transformer and rectifiers are always immersed in oil. This oil serve as an insulator and prevent sparking between various components.
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