I regularly travel to America and Ireland and ocasionally to North and South Africa and put my film through the airport Xray machines in my carry on baggage, sometimes as many as 10 times, and have not yet had a fogged film. I carry 100, 400 and 3200 ISO film. Don't put any film in to your baggage that goes into the hold, I've been told by helpful airport staff in both the UK and America that the Xray machines checking them is mush stronger that those checking carry on. I've never been succsessful in having my film checked by hand in the UK but the US airport staff are generally very helpful. Amsterdam is the worst airport for cooperation with camera equipment that I've ever used, I used to travel KLM from Edinburgh to the US at least twice a year and always had problems, finally I changed my airline and will not fly through Amsterdam ever again.