Stability of pore size in nuclear track membranes

The stability of pore size in nuclear track membranes from PET was examined by electrical conductance measurements. The membranes were etched and stored under various conditions and the result of the measurements of the pore radius showed that pore size can change after etching when the pores were very small. The decrease of pore size can lead to a complete disappearance when the pore radius after etching was smaller as a critical radius depending on the properties of the initial material, the conditions of the etching process and the storage of the mambranes. 6 refs.; 6 figs