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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
I found this while surfing, and it looked so easy I had to try. ...and after spending most of the day working on it I couldn't get it to work. I think the tube voltage I was using wasn't high enough, being just 20-30kV so I'll have to make a multiplier some day. The components needed are an old webcam, vacuum tube and a 40kV+ source, so this is just a heads-up on a nice weekend project.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
The language is Czech (not German) and the device is as dangerous as any other source of ionization radiation… The guy used Pb-enriched glass from color TV screen as a shield. I would go for even better shielding, mainly in case you plan to play with higher voltages (photon-energies)…Be careful, we are still pretty far away from curing leukemia succesfully!
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
Hi All!
I don't know why, i made many experiments in the past but i haven't get any results with ordinary vacuum tubes, i got some results only with a strange kind of lightbulb, but it survived only for short time, so i switched to REAL X-RAY tubes.
recently, i acquired an high vacuum pump (two stages, for air conditioners workers), i found a strange source of glass-to-metal seals, a source of unused getters and i started to blow glass.
This is one of my glass works, a small XRAY tube (croockes tipe) with tungsten anode and rounded chatode..... IT WORKS GREAT!!!!!!!
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
No, I used this tube only with a barium platinocyanide screen (plus a lead sheets and leaded glass for shieldings purposes of course!) maybe, i could make a radiograph with this tube in the next weekend.
Of course, this simple tube cannot beat a real X-RAY tube: the intensity of rays is low and the target is quite big, so i need to put the screened object near the tube and i can obtain only a blurred images; theoretically I could get better pictures if I put the source farther away from the subject, but the exposure time must be longer and i don't know if my tube can survive for long periods.
Anyway, blowing glass is a fantastic hobby, expecially if there is a vacuum pump and some HV power supplies
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Easy CCD camera X-ray machine
I think the tube voltage I was using wasn't high enough, being just 20-30kV so I'll have to make a multiplier some day. The components needed are an old webcam, vacuum tube and a 40kV+ source, so this is just a heads-up on a nice weekend project. 
