Inbound mail, if x-rayed at all, is scanned with vastly different machines to hand baggage at airports and sea ports.
Many travellers can attest that if you keep your undeveloped film in your hand baggage, you're highly unlikely to encounter any problems with the x-ray machines.
Body scanners do not use x-rays or any ionising radiation and do not damage films at all.
There might be more security since 9/11, but I see nothing to indicate that x-ray machines used to scan hand baggage at travel ports and tourist attractions are in any way more intense than in the past....if anything it is the opposite otherwise the operatives would need to wear dosimeters and work strict rotation shifts. The scanners which are used for checked bags on planes have the capacity to deliver more intense scans and are more or less automated...and have been in use in Europe for over 20 years (a load of used ones were shipped from the UK and Germany after 9/11 as nothing in America was good enough to meet the post 9/11 required standards).
There are several of us who are quite seasoned travellers, and barring daft mistakes such as putting film in the hold, none of us has had issues.