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- Newsgroups: rec.photo
- Path: sparky!uunet!noc.near.net!news.Brown.EDU!qt.cs.utexas.edu!cs.utexas.edu!uwm.edu!linac!att!cbnewsm!ka1gt
- From: ka1gt@cbnewsm.cb.att.com (robert.m.atkins)
- Subject: Re: T-MAX fogged by x-ray machines??
- Organization: AT&T
- Distribution: na
- Date: Mon, 25 Jan 1993 18:16:20 GMT
- Message-ID: <1993Jan25.181620.20543@cbnewsm.cb.att.com>
- References: <1993Jan23.151335.1872@cs.brown.edu>
- Lines: 33
-
- In article <1993Jan23.151335.1872@cs.brown.edu>, rjm@cs.brown.edu (Ralph Marshall) writes:
- >
- > I purchased a few rolls of TMAX-3200 for a trip to London, and decided
- > to heed the "Do Not X-Ray" notice on the box. I put all of my film in
- > a small plastic bag which I handed to the security people, making
- > their life easy enough to avoid complaining. When leaving Gatwick on
- > the way back we found a machine which said "This machine will not harm
- > film," which I ignored as usual. However, the guy insisted, so I let
- > them do it. As I was waiting for the bags to come through, I noticed
- > that the display monitors were in false color rather than the usual
- > black and white.
- >
- > So the question is, do you suppose this was some sort of CAT-scan
- > style system rather than X-rays? (This would of course cause no fogging.)
- >
-
- I doubt it. It was probably a sign to give some support to the guards who
- insist on everything going into the scanner. In the USA you can (very, very
- politely) demand hand inspection if there is a problem (and if you are
- prepared for the hassle). Usually there is no problem. Outside the USA
- you are at the mercy of the inspectors. It helps to have everything in
- see-through containers, and in the case of ISO 3200 film, the box which
- clearly states "Do not Xray". By the way I have heard stories about the
- lead bags sold for film, which describe a procedure in which the camera
- bag is stopped in the Xray field while the operator turns up the Xray
- power untill the contents of the bag are visible! Not exactly a good idea
- either. I'm sure the false color you saw on the monitor was simply to
- make things easier to see for the operator. Displaying Xray images in
- false color on a CRT is quite a simple process.
- ===============================================================
- Bob Atkins AT&T Bell Labs email (direct) att!clockwise!rma
- ===============================================================
-
-