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April 2004

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 14 Apr 2004 12:55:09 +0300
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Thanks for the link, Mike. It has never happened to me because my
camera/film is always hand baggage and I always use Kodachrome with a
sensitivity of 25 ASA (i.e., bloody slow).

Brian

Mike Fenner wrote:

> 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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