If you look through the comments on this article, somebody else made the same point, and claimed that it was actually cerium-141, and not Iodine-131:
<<Tim, Thanks for this article and I think you did a great job on a very important but little known topic. I've researched this quite a bit and I'm certain it was cerium-141, not iodine-131, that was lodged in Kodak's packing material that fogged their film, and the packing material was strawboard, not corn husks. (There's some disagreement on the internet - even a U.S. senator who had misspoken on the facts - but if you really dig deep, you'll find it was strawboard.) >>
<<Tim, Thanks for this article and I think you did a great job on a very important but little known topic. I've researched this quite a bit and I'm certain it was cerium-141, not iodine-131, that was lodged in Kodak's packing material that fogged their film, and the packing material was strawboard, not corn husks. (There's some disagreement on the internet - even a U.S. senator who had misspoken on the facts - but if you really dig deep, you'll find it was strawboard.) >>