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Re: [APML] Shelf Life of Refrigerated Film
I might be wrong but I think it is just neutrinos that go right through the Earth - cosmic rays would
not. Now, would they be stopped by a lead bag? Don't know. Suspect it would help at least.
Stuart
Steve.Holak@bcitpa.com wrote:
> I believe that cosmic rays are not stopped by lead; but since most go right
> through the earth, the chances of many striking your film are extremely
> slim.
>
> Steve Holak
> Senior Software Architect
>
> Brokerage Concepts IS Dept.
> 610-491-4879
>
> email: steve.holak@bcitpa.com
>
>
> "Kevin Wigell"
> <kwemail@twcny.rr. To: "APML" <astro-photo@seds.org>
> com> cc:
> Sent by: Subject: Re: [APML] Shelf Life of Refrigerated Film
> astro-photo-bounce
> s@seds.org
>
>
> 02/17/2003 02:22
> PM
> Please respond to
> Kevin Wigell;
> Please respond to
> Discussion of Film
> Astrophotography
>
>
>
> I seem to recall a discussion here a long time ago to the effect that film
> shouldn't be frozen. I don't recall if there ever was a definitive answer
> to that question. I guess I should go search the archives.
>
> I have two freezers at home, both "frost-free". If I'm not mistaken,
> frost-free freezers warm up once a day or so above freezing to melt any
> frost that might be starting to accumulate. If so, I'm wondering if all
> those freeze-thaw cycles might not be worse on film that just keeping it in
> the fridge at what I would hope would be a more constant temperature.
>
> I did find the following document on Kodak's web site that speaks to
> refrigerating film to extend its useful life:
> http://www.kodak.com/cluster/global/en/professional/support/techPubs/e6/e6.jhtml
>
> In general, it doesn't say not to freeze film, but it does mention 55F as a
> recommended temperature for storing professional films. I think I'll stick
> with the more constant temperature in the fridge.
>
> This document says that even frozen or refrigerated, high-speed films'
> lives are limited by exposure to cosmic rays or gamma radiation. I wonder
> if a lead-lined bag would slow down this process?
>
> Any thoughts on this, anyone?
>
> Kevin Wigell
> www.kwastronomy.com
>
> ----- Original Message -----
> From: "Alan Voetsch" <critter12952@yahoo.com>
> To: "Kevin Wigell" <kwemail@twcny.rr.com>; "Discussion of Film
> Astrophotography" <astro-photo@seds.org>
> Sent: Monday, February 17, 2003 13:54
> Subject: Re: [APML] Shelf Life of Refrigerated Film
>
> > Hi Kevin,
> >
> > --- Kevin Wigell <kwemail@twcny.rr.com> wrote:
> > > How long can I realistically expect refrigerated film to stay good?
> > > Will it still be useable in, say, 10 years?
> >
> > Usually for a couple years past expiration. Someone did post last week
> > saying he had used frozen film 6-10 years (don't recall exactly) past
> > expiration. I would suggest if you plan on using it that far in the
> > future that you put half your stash in the freezer. When it comes time
> > to start using it move it into the fridge as you need it.
> >
> > It may be interesting to log that info and post your results to the
> > list 10 years from now. :-)
> >
> > Alan
>
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