Processes involved in positron-matter interaction are studied. The stopping
power and mean free path are calculated for positrons with an energy of ab
out 1 eV, which are scattered mostly by phonons. The mean free path and ran
ge of positrons in tungsten, as well as the stopping power of tungsten, are
calculated for positron energies between 0.025 and 10 eV. (C) 2000 MAIK "N
auka/ Interperiodica".