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Combining X-Rays with other wavelengths in photography?

Started Feb 12, 2019 | Questions
MacM545 Contributing Member • Posts: 783
Combining X-Rays with other wavelengths in photography?

I've seen some examples of X-Ray photography. I was wondering, is it possible to combine X-Ray photos with other wavelengths, such as the full spectrum (UV, VIS, IR)? Would be interesting if some day cameras could record that wide of a spectrum at once.

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ANSWER:
petrochemist Veteran Member • Posts: 3,619
Re: Combining X-Rays with other wavelengths in photography?

MacM545 wrote:

I've seen some examples of X-Ray photography. I was wondering, is it possible to combine X-Ray photos with other wavelengths, such as the full spectrum (UV, VIS, IR)? Would be interesting if some day cameras could record that wide of a spectrum at once.

Film is sensitive to X-rays UV & visible & on occasion NIR, but I don't think normal digital sensors are.

In addition:

I don't know of anything that can successfully focus such a wide range of wavelengths at anywhere near the same point. Focus shift is often significant just going from blue to NIR.

X-ray are highly dangerous & their sources are not available to the general public. They typically fall in ionising radiation regulations (certainly in the UK, I don't know the rest of the world). Hospital staff etc who operate them have shielded areas while the image is exposed & still have to monitor their annual exposure.

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(unknown member) Contributing Member • Posts: 617
Re: Combining X-Rays with other wavelengths in photography?
2

Hi!

X rays are tricky.  First, it is very difficult to focus them (almost impossible outside some very fancy physics labs), so you need to use a pinhole to have anything on focus, and the pinhole material needs to be thick, so probably needs to machine one.

Then, there is the efficiency problem. You need a rather strong source, since pinholes are very inefficient. And a strong source is very dangerous. The third thing is that the camera detectors (and film) are sensitive to X rays, but its sensitivity depends on the thickness of the detector (and of course, the wavelength), and in this case, none of them are particularly thick, so the efficiency drops even more...

I did my PhD in nuclear imaging (for medicine), so I had to deal with radioactive sources on a daily basis. Without training and basic security equipment (lead bricks, dosimeter, etc.), I would not advise anyone to experiment with that.

Sorry for being so negative, but in this case, better safe than sorry.

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Leswick II Senior Member • Posts: 2,192
Re: Combining X-Rays with other wavelengths in photography?

From what I understand, the X-ray film alone is rather contrasty....one of these days I'll use some (5x7), since is rather inexpensive.  If you want more info, I suggest you check out LF forum and there is this long thread....that probably will take you days to go through it.....or you can ask those guys.

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