Archived posting to the Leica Users Group, 1998/03/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]ATanabe wrote: > As a rule the thicker the object (lead bags) the more energy (Xray) needed to > penetrate the object. For example, xray penetration or energy is measured in > KiloVolts (KV) the higher the energy the greater the interactions with objects > in its way (bouncing of electrons) = fogging of film. With the emulsions > today, there is less silver than old emulsions, silver being metalic, reflects > the xray energy and causes the halides to be fogged. One can duplicate this > scatter by piling on cassette after cassette on one another (metal casings > will cause the scatter). The best way to survive airport xrays (if you have > to) is to have a single layer of cassettes on the belt, making the energy > lower (less mass) and reducing the scatter. If you put the film in a lead > bag, the machine will automatically crank up the energy (auto exposure) on the > xray and fog your film. Does this mean that if I use bulk-loaded film in plastic cassettes I'm much less likely to have a problem? In fact, if I don't use metal cassettes at all I suppose it would be possible to hide the films "about one's person" and carry it through the metal detectors so it wouldn't go through the X-ray machines? Simon.