Electron microscopy of fine holes in polyethyleneterephthalate films irradiated by fission fragments

Abstract
Fine holes in polyethyleneterephthalate films prepared by exposing to fission fragments and chemical etching were observed with an electron microscope. Transmission electron micrographs of the films 6−9 μm in thickness were taken using a high−voltage electron microscope. Hole densities ahd hole diameters were determined and found to agree with the values calculated from the irradiating condition and those obtained from the measurements of gaseous diffusion through the films, respectively.