Abstract
The interior of nuclear pore filters was observed by high resolution scanning electron microscopy. In poly(ethylene terephthalate) the interior of the hole with nodules of some widths was observed and the tapering angle observed from the cross section of the hole agreed with that calculated from the ratio of etching rates. In ethylene-tetrafluoroethylene copolymer the holes lie among the fibrils. Only ∼40% fission fragments penetrated and the residual remained in the 12 μm thick film from the observation of cross section of holes and from measurement of radioactive distribution of incident nuclides in the film. In either film the irregular surface was assumed to be induced by the difference of etching between the amorphous and the crystalline regions.
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