Airport scanners won't damage your gear, although very fast film does present some risk. AFAIK, multiple exposures - going through several airports - increase it, but I never had any problems in my film days.
The security checks seem to vary too. I've been through a few in Africa where they were pretty casual and no-one seemed too concerned. Dubai usually ask you to take your laptop out of the bag, but the last time I went though there - very late at night - the security lady just shook her head sleepily when I asked her if she wanted me to do this.