Digital imaging of charged particle track structures with a low-pressure   optical time projection chamber
  We describe first results obtained with a track structure imaging system for measuring the ionisation topology of charged particles in a low-pressure gas. The detection method is based on a time projection chamber (TPC) filled with low-pressure triethylamine (TEA). Images of ionisation tracks of electrons, protons, and heavier ions are presented and analysed. 
U. Titt, V. Dangendorf, H. Schuhmacher