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Full-wave X-Ray generator

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Linas
Sat May 21 2011, 03:47PM Print
Linas 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

1305992295 1143 FT0 2

capacitors for full-wave multiplier:

1305992317 1143 FT66676 P1590591

Diodes 14KV 50ns 3mA 0,5Apeak:

1305992358 1143 FT66676 P1590596

40A SMPS IR2153:

1305992390 1143 FT66676 P1590611

Diodes:

1305992426 1143 FT66676 P1590612

HV power transformers:

1305992453 1143 FT66676 P1590635

Just before layer of paraffin:

1305992477 1143 FT66676 P1590621

Full-setup (no HV transformers jet):

1305992535 1143 FT66676 P1590630

Final product:

1305992574 1143 FT66676 P1590636

Test photos:
Canon lens:

1305992615 1143 FT66676 Img 3057

FAN's:

1305992648 1143 FT66676 Img 3060

LED flashlight:

1305992682 1143 FT66676 Img 3059

Siemens C25:

1305992712 1143 FT66676 Img 3055

Sony Ericsson w960i:

1305992788 1143 FT66676 Img 3056

Old style w960i:

1305992823 1143 FT66676 Scan10003

C25:

1305992850 1143 FT66676 Scan10001




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Wolfram
Sat May 21 2011, 04:10PM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Nice results, and very solidly built project.

What is the focal spot size of the tube?

The last two x-rays, are they on film or photographic paper?

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Linas
Sat May 21 2011, 04:21PM
Linas 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 Link2
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Wolfram
Sat May 21 2011, 04:31PM
Wolfram 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 Link2 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?
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Linas
Sat May 21 2011, 04:35PM
Linas 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 Link2 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 ? mistrust
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Wolfram
Sat May 21 2011, 04:42PM
Wolfram 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.
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Linas
Sat May 21 2011, 05:22PM
Linas 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 confused
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Wolfram
Sat May 21 2011, 05:41PM
Wolfram 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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Linas
Thu Jun 16 2011, 06:46PM
Linas Registered Member #1143 Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
my notebook. at 2s exp time
1308249988 1143 FT116086 P1590691
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Thomas W
Thu Jun 16 2011, 09:31PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
thats realy cool better then anything i could make :D
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