I just completed a trans-Pacific trip that included an enroute stop going both ways and ran HIE (unexposed going one way and exposed the other way through Seoul/Incheon, Seattle, and San Francisco) through the carry-on X-ray; Upon returning I processed the film and had no problem whatsoever with fogging or negative quality in general.(posted 8481 days ago)I've also done it before on domestic trips (US) also with no problems... based on my experience so far, CARRY-ON X-rays should be OK. I also agree with the statement that infrared (as with all films) should NOT go through checked baggage X-ray machines.