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The bullseye seems to correspond with the shape and size of the radioactive button ...Perhaps the button was sitting there previously and has made the floor of the chamber radioactive in a bullseye pattern. [ The smaller rings at 12 & 2 o'clock, (the "lobes") , could be caused by the button being turned the other way up from its current position ].
... the bull's eye was visible for a fraction of a second--it's only pure chance it was photographed ...
Quote from: ArtAndScience on 29/04/2013 00:32:23... the bull's eye was visible for a fraction of a second--it's only pure chance it was photographed ...Perhaps the conditions in the cloud chamber which showed the radioactive footprint(s) of the button's previous position(s) only existed momentarily.Gamma-rays can fog film (and the digital equivalent), but even if you had placed the button on the back of the camera earlier it would produce a circular not elliptical shape.
...What I don't understand is why you want to pursue an explanation for the button as being the cause, simply because it's a vaguely similar shape-