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The interaction of ionizing radiation with nanometric targets is a field ofinterest for many branches of science such as: radiology, oncology, radiationprotection and nanoelectronics. A new experimental technique known asnanodosimetry has been developed for the qualitative as well as quantitativedescription of these types of interactions. The work presented here is acontribution to this development, namely by further improvement of the newexperimental technique called the Jet Counter, originally developed at theAndrzej So{\l}tan Institute for Nuclear Studies. The Jet Counter is a uniquedevice in the world for studying the interaction of low energy electrons withnanometer targets in the range 2-10 nm (in unit density). The basicexperimental result is the frequency distribution of ionization cluster sizeproduced by ionizing particles in a gaseous (nitrogen or propane) nanometrictrack segment. The first experimental data on the frequency distribution ofionization cluster size produced by low energy "single" electrons (100 eV -2000 eV) in target cylinders of nitrogen (N2) 0.34 {\mu}g/cm2. in diameter arepresented. New experimental data on the frequency distribution of ionizationcluster size produced by 3.8 MeV {\alpha}-particles in a target cylinder ofnitrogen (N2) and propane gas (C3H8), ranging from 0.1 to 0.5 {\mu}g/cm2 indiameter are presented. Experimental results are compared with Monte Carlosimulations. A Bayesian analysis is applied for convoluting the measuredspectra to the true cluster size distributions. New quantities characterizingthe interaction of ionizing radiation with the nanometre level are proposed,namely - P1, M1 and F2. It has been shown that these quantities may substitutefor the traditional (macro) dosimetric quantities.

Ionization Cluster Size Distributions Created by Low Energy Electrons and Alpha Particles in Nanometric Track Segment in Gases