Electron Penetration through Aluminium

Abstract

The problem of electron penetration is treated analytically in an infinite homogeneous medium employing a segment model on the track of the electron. The intensity of the electron flux is obtained as a function of the energy, the direction of motion and the spatial variables. The numerical application is done for 2MeV perpendicular source in aluminium. Comparisons are made with Spencer's theory on energy dissipation and it is found that the moment coefficients of the electron flux obtained from both theories are generally consistent of with each other. Penetration probability calculated is compared with the experimental results and a fair agreement is found except in a shallow and a very deep layer. Energy distribution of the penetrating electron is also calculated, taking into consideration the straggling of the energy loss and the experimental plots well agree the theoretical distribution curve for moderate and deep penetration.