From the case:
Photographic plate made by Henri Becquerel (photo)
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Photographic plate made by Henri Becquerel showing effects of exposure to radioactivity.
Case Discussion
"Photographic plate made by Henri Becquerel showing effects of exposure to radioactivity"
Licensed under Public Domain via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Becquerel_plate.jpg