X- ray Banding is caused by materials they in some way interfere with x-ray machine. Imagine it like x-raying of your bones. If you pack film in area where you have a number of different materials around your film, i.e. steel, paper, glass, plastic etc. you will get a banding.
Because I knew that, the prevention I do is that I always carry film and my film holders in special case which contains fabric only with dry zippers. Therefore I do not have any "banding".
Just my 2 cents.
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