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Subject: Testing used X-ray tubes

Date: 03/29/00 at 1:22 PM
Posted by: Mike Gray
E-mail: mike@win.bright.net
Message Posted:

My company repairs dental and podiatry X-ray tubeheads (that contain stationary anode tubes). We currently test used tubes in three ways: 1. Visually (look at depth of etching on anode, and amount of sputtered tungston on glass). 2. Check condition of filament (does it "light up"?). 3. Apply high voltage from induction coil across tube to check for presence of gas (purple glow). I would like to know if there are more detailed testing techniques that determine more about the condition of the tube. I'm thinking in the lines of applying filament voltage, and ramping a reduced high voltage across the tube to determine its voltage/current conduction curve. But without knowing what the manufacture's specs are on most used tubes, the data won't be useful. By being able to pre-test a tube before installing it back into the tubehead and placeing it under vacuum to remove gas and moisture (which takes many hours), it would save a lot of time. Can anyone experienced in testing X-ray tubes give me a hand here?

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