How to use an x-ray tube
The basic principle of the hot cathode electron X-ray tube
In a high-voltage electric field, the hot-emitting electron beam of the cathode will fly to the anode target surface, and the target surface is bombarded by electrons and generates X-rays.
Inspect of the inner of x ray tube
There should be no foreign matter in the tube, and the degree of vacuum inspection: X-ray tube can only work normally under high vacuum condition, generally: 1.33kPa-0.67kPa or higher, and high at 1.33kPa•0.93kPa.
There are two ways to check the degree of vacuum:
One is high-frequency method- using high-frequency pulse method (ultra-short wave or high-frequency generator) to judge whether the vacuum inside the tube is good: the tube is placed and electrified between the two ultra-short wave electrodes. If the tube generates glows, that means the tube has air leakage. The brightness of the glow indicates the severity of the leak; If the tube has no glow, that means the tube has a large amount of air leakage, and the filament is easily burned after being electrified.
The other is cold high-voltage method. The X-ray tube filament is not heated, and the high voltage is applied to both ends of the X-ray tube. The high voltage should not be too high, it is allowed to be only 30%-35% of the maximum working voltage. If the tube generates glows inside, that means the tube has air leakage, and the tube will generate a spark discharge when the air leakage is too serious.
