I travel often and airports always tell me to carry on my cameras especially my digital memory cards and film. Ive often heard that if you check your baggage that they x-ray it through a much larger x-ray machine than the walk-through machine if you just carry it with you. We’ve all had a few incidents at one time or another when we got home after a trip and found some bad exposure but it may have been unrelated to x-rays since there are so many other factors that can affect digital cards and film even when shooting. Either way I always carry-on my camera cards and film through airports.