Derivation of a Dose Mean Value of Lineal Energy from Variance Measurements of a Secondary Electron Emission Current

In this investigation, variance measurements of the secondary electron emission current from an evacuated chamber have been performed and a formula to calculate in these experiments has been derived. The value obtained for is within 50% of obtained with a gas detector and a factor of 2 greater than calculated values. The mean track length and the V_track term were also calculated for this irradiation geometry, V_track being of the same order of magnitude as V_track for a sphere.