Re: X-ray film capacitors

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim DeLillo by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimdel-at-bellatlantic-dot-net>

	If the film is unprocessed it contains silver halides
	If the film is processed it contains metallic silver grains in the
exposed areas
	If the film is unprocessed, then processing an unexposed film will
result in no silver.
	If you do not want to fully process the unexposed film a solution of
sodium 	hyposulfate(photo fixer) will remove the unexposed silver.
	If you want to remove the unexposed emulsion entirely, then a household
bleach will
	strip it off quite easily.

Typically the film is made from Estar (I do not know its dielectric
properties) in about 7 mil thickness

<< Jim >>


Tesla list wrote:
> 
> Original poster: "Christopher Boden by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <chrisboden-at-hotmail-dot-com>
> 
> >Original poster: "Fred Bultman by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> ><royaloakmin-at-home-dot-com>
> >
> >Hi all
> >
> >With some of the recent discussion of home made capacitors, I decided to
> >try to
> >make my own. I used a 4x10 sheet of Kodak dental x-ray film, with a sheet
> >of Al
> >foil on each side. I tested it up to 15 kvac, and the discharge was very
> >hot
> >and loud. My only concern was what material the film is made out of. Could
> >it
> >be lossy at RF like Mylar? How many sheets would I need for 30nf?
> >Thanks,
> >Jim Bultman in MI
> 
> The Geek Group, has access to a LARGE amount of X-ray film sheets in the
> standard sizes. Both dental (long spools of about 5" wide) and regular,
> (about 12X18" or so...it's been a few years since I operated a process
> camera, lol).
> 
> I'll ask around and get the exact compoud they're made from. I'll also put a
> micrometer on a sheet. Anyone who wants to pursue this let me know, I'd be
> happy to scrounge a bunch of film.
> 
> Remember, some films (I don't know if X-ray works this wa or not) contain
> Silver Halide as the photoreactive chemical. Last time I checked silver was
> a rather good conductor. This could have catastrophic results in a
> capacitor.  But I don't know enough of the chemistry of X-ray photography to
> really say. Anyone out there know?
> 
> Chris "Your packet-switched-electro-lithographic" Boden
> _________________________________________________________________
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-- 
Jim DeLillo
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