Avoid the whole mess and get a lead bag for your sheet film to and from your destination. My brother who lives in Tokyo brough me back 2 boxes of Fuji 5x7 Velvia (20 sheets each) in a Hakuba X-Ray safety case DX IN HIS CARRY ON BAGGAGE. Dimensions are 80mm W x 165mm L x 180mm H. It is rated safe to ISO 1600. However, on the back of the bag there is a warning "Be sure to put your films into your carry on baggage when you board a plane." "Never put films them into air cargoes for even highly resistant X-Ray protective pouches cannot avoid film exposure from the more powerful CT scanning."
Hope this helps.
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