[pure-silver] Re: [pure-silver]Radiographic film, was: Oh How I Miss This Paper
- From: "bonner" <bguil@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 29 Jan 2011 10:21:03 -0500
X ray film was originally designed to be sensitive to blue light, the old
cassette phosphor. Later, rare earth materials were used in the cassette
phosphors which provided more light per photon, and film was redesigned to
respond to these new x ray screen phosphors, usually green light. Later
still, when laser printers were adapted to medical imaging, green was a
common choice, so many green sensitive laser films were made. As expected,
there were variations from the different companies who tweaked their own
versions. Usually, the films will specify phosphor type as blue or green
sensitive as you have noticed. You should be able to adjust your filter
packs to get more speed from the film, but experimentation will be needed.
The films may be labeled as general purpose, high speed, detail, etc.
Generally, the slower products have more resolution and use flat grain,
anticrossover techniques and such. Film labeled half speed might be single
emulsion, as is duplicating film, laser, mammomography, etc.(just scratch
both sides to find out). A deep red safe light should work OK, but check.
beeg
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Pablo Kolodny
Sent: Friday, January 28, 2011 9:09 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: [pure-silver]Radiographic film, was: Oh How I
Miss This Paper
I've just found out some Kodak X Ray film is available at the local auction
site, not much visible in the tiny picture the auction page is showing but I
can see something like this: "Kodak X Ray Film, General Purpose Green".
This is sort of coherent with what you're saying, would this mean the film
is only green light sensitive or even more specific green laser beam
sensitive so I can't expose to ambient light ?
Thanks in advance
Pablo
On 1/28/11 7:36 PM, "bonner" <bguil@xxxxxxxxxxxxx> wrote:
> Keep in mind most x ray film is double coated, although some, usually
smaller
> sizes, may be single coated for better resolution. Also, the films are
made
> to be sensitive either to blue (x ray film holders contain blue emitting
> phosphor) or green (usually laser printers) light frequencies (exposure is
by
> light, not the x ray). Most films, especially at slower speeds, contain
anti
> crossover technology, and frequently use flat grain.
> beeg
>
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