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通常於兩個情形下會面對X-Ray
911前後也好，其實菲林一定唔好寄倉
Case 1 - Travelling
Ideally, film shold not be x-rayed
Unprocessed film is light and heat sensitive and exposure to x-rays can fog the film. he amount of damage results from a combination of the ISO rating, the strength of the x-rays and the number of times the film is scanned. The good news is that Kodak have done extensive tests and found that slow- and medium-speed films can handle upto 16 passes through the x-ray machines used to check HAND LUGGAGE at modern western airports. The more light sensitive, faster film, from 400 ISO, are much more susceptible to x-ray damage. Limit their exposure to four or five passes.
Hand inspections are not usually a problem, even with the with the recent focus on airport security, but there are ways of making the request less painful for the security staff. Take all film out of the boxes and plastic containers and carry it in a clear plastic bag or box. Before you get to the security check remove your film and put your camera bag through the machine, making sure there's no film in your cameras. This indicaes that you 're doing your best to comply with security requirements and packaging of the film in clear containers makes the security staff's job easier. It's also worth getting to the security check with plenty of time to spare so you have time to wait if the security staff claim to be too busy to hand-check bags. Remember, they're only doing their job, and after all it's for your protection, so be patient and courteous.
Lead-lined bags (e.g. DOMKE, USA) may give you some peace of mind if a hand-check is refused. The lead lining stops the x-ray penetrating the bag, but may cause the inspector to increase the dosage. If you're lucky, the presence of a solid black package in your bag will simply lead to a hand-check after the x-ray.
NEVER PACK FILM IN YOUR CHECK-IN LUGGAGE
Case 2 - Shipping Unprocessed or Processed Film to HK use (e.g. Japan's Special Film)
If you do ship processed film, send the negatives and prints separately, and post them a week apart from different post offices. If you've numbered your films sequentially, split them into odds and evens and ship them separately, again on separate day from separate places. If the worst happens, you won't lose a big chunk of images from one part of your trip.
Ship unprocessed film with one of the main air-courier services, rather than through the post. The extra expense is well justified. Shipping unprocessed film raises the issue of x-rays again. Parcels may be x-rayed. Depending on the comopany, and the countries you're shipping between, you may be able to get an assurance from the agent that parcels won't be x-rayed, but there's some risk. Identify your parcels as having undeveloped film inside: not to be x-rayed.
Tips by Richard I'Anson - Lonely Planet
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