yes it appears lead lined bags arent the answer. UPS does not irradiate, and all others do, that is, domestic shipping?? i didnt nkow there was any radiation going on on domestic shipping....
anyhow, about the lead bags, here is stuff i found, which confirms what you say.. :
>Lead Lined Pouches Aren't the Answer
Lead lined bags DO NOT protect your film against a high powered scan. If that second pass is unable to see through an opaque object (such as a lead lined pouch) your bags may be pulled and searched by airport security. The procedure differs from airport to airport and country to country and may include your being pulled off of the plane and/or the plane being delayed while the search is conducted (making you very popular with fellow passengers).
>So packing your film into lead lined containers may actually CAUSE your film to be damaged because they are likely to prompt a high powered scan. Because they may still show up as opaque to the second scan (depending on the thickness of the lead) they may also cause your bag to be pulled for a hand inspection.
and some more scary stuff from somebody who worked there:
>Want to set off the Powers that be to be? Put a block of hard cheese in a lead bag. I used to work for the TSA and if we could not see something or if it looked weird... I was always nice to phothographers... but then again I was not the only person there. We had the power to turn up the amount of radiation.... it was kept at about 2-3 but the dial went to 10. we were allowed to take it to 6 Without a supervisor allowing it... But that did happen with a note that said.. if in doubt go without her word.