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Registered Member #1721
Joined: Sat Sept 27 2008, 08:44PM
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Posts: 136
Hello:
I used to have this same model x-ray tube, it is a nice tube from a high power dental, podiatry machine. I ran the filament with a 6 volt battery and a reostat. One nice thing about his tube is the thin glass window which allows it to emit x-rays at lower KV ranges than most small tubes. I used mine to photograph flowers at 15KV with a NST and a FWB rectifier. Tulips, roses, and orchids are real cool. If your tube vacuum is good you are ready. Try to keep the filament current as low as possible for long tube life, this is what goes out first. This tube will handle up to 90 KV max. It originaly had mushroom shaped anti-corona terminals attached to the ends, and it opperated in air.
If it has not been used for a while, slowly ramp up the KV, this is called "conditioning" it allows the tube to re-absorb gasses via the same idea as an ion pump.
Try to get some expired Omnipaque, or its generic equivilent, it is an organic iodine compound X-ray dye, clear to the eye but opaque to X-ray's. This stuff is a lot of fun. You can for example let a plant suck it up, then allow an insect to feed on it, and X-ray it. I once did a stink bug on 35mm Tech Pan film with the tube 60" from the subject, then I put the resulting negative in an enlarger and printed a 8 x 10 of it. You could see its digestive system clearly (I did cheat and put a tiny drop on its mouth also, and rinsed it). This stuff expires, so you can get it free at your local hospital, and its non toxic.
Overall a very nice tube perfect for hobby use without the massive skin risk of a beryllium window tube, I miss mine.
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Uzzors' Coolidge X-ray Machine
