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You might be able to see it if you remain in a totally dark room for a number of hours so your eyesight is fully dark adapted. The eye can register as few as 10 photons per second. The hard bit is the "totally dark room". By that I mean not a single photon enters. In practice you would have to do this underground, probably in a cave.


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As the lifetime of the thorium you have available is so long , the probability of an atom decaying is very small . In addition the transit velocity of an electron which is traveling with a velocity higher than the phase velocity of light in water, will be in a time frame undetectable to the eye, so the cerenkov radiation from that single electron will be in ...



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