Electron Microscopic Study of Fission Fragment Damage in Molybdenite Crystals

概要

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Electron microscopic observation was carried out on fission fragment-irradiated molybdenite crystals. Tracks of fission fragments in the crystals were observed as continuous straight lines and linear arrays of spots and rings. From the change of their image contrasts in the tilting experiment and the disturbance in the moire patterns around the tracks, it was found that the track consists of a narrow non-uniform cylindrical region associated by some dotted blister-like swellings. The origin of such blister-like regions may be interpreted by either of the non-uniform solidification in the temperature spiked region along the path of fission fragment or more probably the displacement spike effect by the knockons with energies higher than about 500 eV. Bent and forked tracks resulting from nuclear collisions between fission fragments passing through the lattice and atoms on the lattice sites were observed and analysed. Interaction between dislocation lines and the tracks was observed, indicating that strong stress fields around the tracks cause the slip motion of the dislocations by elastic interaction.
社団法人日本物理学会の論文
1963-04-05