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Radiation at altitude is enough to damage digital camera sensors, in so much as it might take out one or 2 pixels. Lots of solar radiation is diminishing in power as it travels through earths atmosphere, hence less damaging at lower altitudes.
Airhead-
it might take out one or 2 pixels
you're kidding, right
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When I was in Tokyo during the big 'quake and there was a slightly elevated radiation level in the city following the damage to the power plant, one of the stranger facts we discovered was that the additional exposure we would get was about half as much as we would receive during the 13 hour flight back to Blighty. Still didn't stop a whole bunch of people leaving.
salad
beseku
I guess it depends on the airport / their scanners.
I was told by a security guy a couple years ago that the "modern" scanners are way less harsh.
They also say that the radiation during the flight itself is much higher than the scanners themselves - never really figured out why exactly, but long story short I had a lot of film with me on flights, and sometimes in hold luggage as well and basically it has been fine, apart from some ISO 1600 / 3200 and some rolls I took back and forth like 10 times, which were a bit foggy .