There he uses the high-powered microscope to count the number of fission tracks in the sample due to spontaneous fission of uranium.
(he; uses; the high-powered microscope; to count the number of fission tracks in the sample due to spontaneous fission of uranium; L:There)
he
uses
the high-powered microscope to count the number of fission tracks in the sample due to spontaneous fission of uranium L:There