The Absorption of High Energy Electrons. Part III

Abstract

Losses in lead of electrons with energies both above and below the range previously used (2 to 11 Mev) have been measured. For the low energy group electrons from radioactive ${\mathrm{P}}^{32}$ were sent through lead laminae of two thicknesses placed in the center of a cloud chamber. In this energy region the losses in lead should be due almost entirely to ionization processes. The experimental values for the energy losses are from 2 to 4 times those given by the Bloch formula. For the high energy group the electrons and positrons produced by the Li+${\mathrm{H}}^1$ gamma-radiation were used. The values found are about 50 percent greater than the calculated losses due to ionization and radiation, but are in good accord with the previous experimental values.