Hi Two factors here. One is that the scanner doesn't have a lot of the right wave length light. Two is that even a piece of paper will absorb +99% of any of the UV that would erase it. As long as there is something over the windows ( almost anything ), I wouldn't worry. When I was at Intel, we placed some 1702A's in direct sun light for several weeks without data loss. A few seconds in a scanner would most likely have little effect. If you are concerned, put some black electrical tape over any windows. If you don't believe that will block the light try doing it on a separate EPROM and put it under an eraser light ( you'll see what I mean when I say that even a piece of paper is quite effective, even in a strong UV light ).