Basic research on nuclear track microfilters, NTMF, made from the polyimide
foil UPILEX, has been carried out to investigate the possible use of NTMF
for gas separation in an environment containing large amounts of tritium. N
TMF with a pore diameter as low as 0.1 mu m have been etched and metal repl
icas of the pores have been produced to determine the pore shape. An experi
mental setup for determining the separation factor of a NTMF for a given ga
s mixture has been constructed, and first experiments have been carried out
.