X Ray Film photography using fusor

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Emma Black
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X Ray Film photography using fusor

Post by Emma Black »

This is slightly off topic fusor wise, but thought it would make an interesting little side experiment. Being a bit of a fan of film photography, both the modern and wet plate collodion (very messy) wanted to see if I could capture some of the fusors X Rays on film.

Normally you use specific X ray film with proper emulsion layer that blackens in response to the light from the intensifying screen, with different types of film for different contrast needs.

With enough X Ray intensity though, regular high speed film should work. I had originally intended to use a sheet of large format film and an intensifying screen, stuck together in a dark bag. The the bag would be placed near the fusors viewport, with an object to image in between, I would then develop the film as normal.

However, came up with a much simpler method using Polaroid film (the relatively new "impossible" stuff with an iso of around 400). These film cartridges contain 8 frames and the process was as follows:
-Run cartridge down to 2 remaining frames and remove from camera. Frame number 7 is sacrificial as its going to get exposed to the light as soon as its removed from the camera. We are just using it to block the normal light.
-tape cartridge to viewport of fusor
-exposed with x rays at 60k CPM for 22 seconds, 31kv voltage (obviously behind a shield)
-put cartridge back in camera, frame 7 will eject automatically.
-Take photo with lens cap on, with minimal brightness. Frame 8 will get developed as it passes though the cameras rollers.

Considering I completely guessed the timing, surprised it produced an image of the viewport first time. I will try next with some kind of subject matter in-between like some potted electronics.

Image

Image
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Liam David
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Re: X Ray Film photography using fusor

Post by Liam David »

Nice work. You might be able to make a rudimentary x-ray camera to see some of the electron dynamics: viewtopic.php?p=82268#p82268
Emma Black
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Re: X Ray Film photography using fusor

Post by Emma Black »

Liam thank you I had not seen that post, how interesting! It's not very clear in the photo but in person you can see a darker line, which is presumably where the grid is.
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Richard Hull
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Re: X Ray Film photography using fusor

Post by Richard Hull »

Too bad the old sheet film isn't available in royal X pan anymore (ASA 4000). I have 2 old 4X5 speed graphics and an ancient 2 1/4 X 3 1/4 anniversary speed graphic. Used them for years. I checked, B&H photo has both plus X ASA 125 and Tri X ASA 400 , 4X5 Sheet film, 25 sheets for $35.00 This could be cut to suit this app. Would make 100 small sheets 2 X 2 1/2. Microdol-X would be a fine grain developer.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.
Emma Black
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Re: X Ray Film photography using fusor

Post by Emma Black »

4000 is some fast film for 4x5. Current stocks on hand are a mix of illford 400 and various C41 colour films or E6 slide stuff, again fastest is around 400. The instant stuff is expensive at over £1 a shot, but hassle free.

My usual collodion process, using my 120 year old camera gives a really fine grain but with a speed of around ISO1!

I'll have a go at making a simple pinhole camera using a thick metal plate to attempt to focus the X rays and will report back.
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Dennis P Brown
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Re: X Ray Film photography using fusor

Post by Dennis P Brown »

Unlikely a pin hole will focus x-rays; one uses atomic plains - like graphite or silicon crystals.
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Liam David
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Re: X Ray Film photography using fusor

Post by Liam David »

A pinhole doesn't focus x-rays. It acts somewhat like a lens, mapping linear coordinate to angle and back to linear coordinate on the sensor (x -> theta -> y). It is completely analogous to a pinhole camera that is/was occasionally used in photography.
Emma Black
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Re: X Ray Film photography using fusor

Post by Emma Black »

Yeah focus was a poor word choice on my part, I was thinking in photography terms rather than actually whats happening. I get that a pinhole maps a 3D image onto a 2D projection i.e. the sensor, obviously its not actually a lens.
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