I happened across an article by Timothy Vitale (Paper and Photograph
Conservator and Consultant, Preservation Associates) in RLG's Diginews
about this topic recently, and as it's an issue I used to get regular
enquiries about when I was at the MDA, I thought I'd post it to the
list.
Basically, the upshot of the study is that the light emitted from
flatbed scanners will have a negligible impact on the vast majority of
objects:
> The average exposure was 11 lx-hrs, which is 1-2% of a daily exposure
> on a museum wall, or 0.000011- 0.000026% of an object's predicted
> life.
> Most scans will be from 1-15 lx-hrs, which is a minuscule fraction
> of the useful life of a document or artwork.
The full article is at:
http://www.thames.rlg.org/preserv/diginews/diginews2-5.html#technical
Cheers,
T.
-- Tony Gill --------------------------------- ADAM Project Leader --
Surrey Institute of Art & Design * Farnham * Surrey * GU9 7DS * UK
Tel: +44 (0)1252 892721 * Fax: +44 (0)1252 892725
-- [log in to unmask] -- http://adam.ac.uk/ -- http://vads.ahds.ac.uk/ --
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