As someone who shoots up to 20 rolls of film on African holidays I have
an interest in this area.
I think there maybe some confusion here between the scanning
technologies of MRI and CT/CAT. Airport systems do use modified versions
of the scanning systems developed originally for medical use. But
(outside US anyway) the airport systems are X ray based and the newer
automated systems such as at Heathrow use computerised tomography (where
multiple x ray pictures are taken and build up 3 D images from slices).
The automated systems do a first quick scan, suspect bags are flagged
and re-x-rayed and then may get an intensive x ray and even opened. So
if your itinerary involves several flights per trip your silver film is
going to be affected. Digital cameras are not effected by this
(allegedly).
Current advise is to process your silver film before flying or keep
unprocessed film in your hand baggage as x-rays are less powerful and
you have the option of hand inspection. Checked or hold baggage gets a
bigger dose as above which will fog [faster] speed film stock for sure.
These two links explain, the second is a series of images showing the
effects.
http://www.kodak.com/global/en/service/tib/tib5201.shtml#SEC43
http://www.kodak.com/global/en/service/tib/tib5201.shtml#SEC47
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: 14 April 2004 07:00
To: [log in to unmask]
Subject: Re: [TN] Computer Hard drive damage due to X-Ray / MRI
I wasnn't going to open the PDF, as it is big for a 56 kbit/s modem, but
MRI is no use for baggage checking. It is of use only where live cells
have sufficient water to create resonances. I understand that baggage
checking machines have a "soft" (long wavelength) and a "hard" X-ray
imaging system, allowing image processing to indicate visually, by
different colours, the nature of the bag contents. The radiation levels
are very low. There are no major magnetic fields. HDDs are protected by
high-permeability magnetic screens, in any case. I've not only passed
computers galore through X-rays, but also magnetic tape, cameras,
camcorders, film etc. without damage.
Brian
Steve Gregory wrote:
> Just did a search, and found this:
>
> http://www.travelsentry.org/images/airlines.pdf
>
> a "MRI like" kind of screening. What does that mean?
>
> Ken, you've opened a "can of worms"...
>
> -Steve Gregory-
>
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