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BS>An electron microscopic method for studying individual fission events in U/sup 235/ was developed which uses an uranium sandwich consisting of a 10-A U/ sup 235/ film between two 50-A aluminum films and which was prepared by evaporation on a NaCl cleavage face. This sandwich is sealed in an aluminum capsule. irradiated to a dose of 2.8 x 1O/sup 15/ neutrons/ cm/sup 2/ (thermal), floated off the NaCl crystal on water, and mounted on copper grids for electron microscopic examination, which shows light tracks (lOO A wide, lOO to 20,000 A long) on a darker aluminum matrix. The tracks are probably due to vaporization of aluminum atoms along the path of the fission fragments. Annealing or electron bombardment does not change the track appearance. Similar results were obtained for copper, platinum, and silver as the matrix. (D.L.C.)
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Kelsch et al. (1960) studied this question.
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