Random Numbers are generated through the detection of cosmic rays. The system goes back to the Wilson cloud chamber (~1920) which is a particle detector used for detecting ionizing radiation.
The detail shot shows how the system is visualising the trails of alpha particles from a radioactive needle source (pb210/lead).
Part of the Series »The Known Unknowns« (2011) (jonas-loh.com/knownunkowns.php)
Steffen Fielder (steffenfiedler.com/ )
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