Mapping the Sensitive Volume of an Ion-Counting Nanodosimeter
  We present two methods of independently mapping the dimensions of the sensitive volume in an ion-counting nanodosimeter. The first method is based on a calculational approach simulating the extraction of ions from the sensitive volume, and the second method on probing the sensitive volume with 250 MeV protons. Sensitive-volume maps obtained with both methods are compared and systematic errors inherent in both methods are quantified. 
Reinhard Schulte, Vladimir Bashkirov, Sergei Shchemelinin, Amos   Breskin, Rachel Chechik, Guy Garty, Andrew Wroe, Bernd Gro...