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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Here is my first and last one x-ray generator It contains 100KV 10mA oil cooled x ray tube, 2KW IR2153 SMPS, 2-phase 15KV 0,05A HF transformers, high power full wave 8x voltage multiplier for low ripple voltages, and 1500pcs of 3mA 50ns 0,5Apeak diodes, and filament supply Few photos: X ray tube
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
I don't know, still need to find it. as you can see i get sharp-less photos, just with x-ray film i get quite nice results Konica Minolta x ray film MG-SR
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Ok, if you're interested, I can give you a tip to get higher resolution x-rays. Resolution like this example should be possible with your x-ray generator.
I would guess the focal spot size is around a millimeter, judging from the anode angle and rated current. What voltage and current are you running at?
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Anders M. wrote ...
Ok, if you're interested, I can give you a tip to get higher resolution x-rays. Resolution like this example should be possible with your x-ray generator.
I would guess the focal spot size is around a millimeter, judging from the anode angle and rated current. What voltage and current are you running at?
I don't know, First i am using low filament current to get as high x-ray energy as possible, and drawing around 60-80W at full power.( for safety reasons) nice picture, just question how to make that ?
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Did you use the film in an intensifying cassette? Those tend to really limit the resolution, with the "Ultra fast" or "Ultra rapid" ones being the worst, and the "Fine" or "Detail" ones, being the best. Mammography cassettes are even higher resolution, but they should only be used with mammography film (emulsion on one side only, like normal photographic film), since they only have a single fluorescent screen (this is one of the reasons that they have higher resolution). Direct film exposure, without an intensifying screen, gives by far the highest resolution. The picture I linked to in the last post is a direct exposure. This also requires much longer exposure time. You can also get limited resolution if the x-ray tube is close to the object you're x-raying, especially if the focal spot is large. Increase the distance, but not too much (inverse square law), somewhere between 50cm and 100cm from tube to object is a nice compromise.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
it looks like i am getting 0,6-1mA 80-100Kv for tube... just made some measurements. but i don't know how accurate they are since multimeter is electronic... And yes, i was using intensifying screen to make photos with film, maybe i need to try without them later
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
With a direct film exposure, remember that you need a much longer exposure time, probably 10-20 times as long as with the intensifying cassette, maybe even longer. A minute or two in your case I guess, depending on the distance between the tube and the film.
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Full-wave X-Ray generator
