My brother-in-law is the head of X-ray in a hospital in Florida. He
explained to me that x-rays do not directly expose film. To get the image
they need, a fine wire grid is sandwitched with the film in the film
holder. When the x-rays strike the wire, they cause it to give off
(photons?) thus exposing the film.
I don't know if that also applies to 35mm film, but it would make sense
that the x-rays striking the zipper could do the same thing. Anyone on the
list a Physicist who can help us out?
Gregg
At 11:46 AM 10/28/2000 -0500, you wrote:
Many years ago, a friend who had just returned to the US from a vacation
in Europe (I forget where) brought me some negatives with a "light leak"
he wanted me to diagnose. Strangely enough, it had only occurred on one
roll of film.
Inspection revealed that it wasn't a light leak - it was the "shadow" of
the zipper of the fitted case around the camera (an Olympus 35 EC-2 or
ECR, I don't recall which) when it passed through the X-ray machine.
The X-rays had fogged the film, casting a repetitive image of the
zipper's teeth through each loop of film that was wrapped around the
take-up spool.
Giles wrote:
>
> I think, given a fixed power level for the XRay, there would be a very
> slight degree of extra protection offered by an all metal body.
>
> Giles
>
> Chris Barker wrote:
>
> > Are our metal-bodied SLRs less likely to be affected (the film inside I
> > mean) than a plastic-bodied P & S, does anyone know? I am clueless on
> > X-Ray technology.
>
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