Radiation Damage in Pt Produced by 1.8-3.0-MeV Electrons

The change in electrical resistivity in Pt, $R\left(E\right)=\Delta \rho /\mathrm{electron}$ ${\mathrm{cm}}^2$, was measured in the energy range 1.8-3.0 MeV. The experimental values found in this interval are consistent with a displacement threshold of 37 eV, using the Mott equation for relativistically scattered electrons. The resistivity increase per unit integrated flux at 2.0 MeV was found to be 4.6×${10}^{-26\mathrm{}}$ Ω cm/electron ${\mathrm{cm}}^2$, which yields 7.5×${10}^{-4\mathrm{}}$ for ${\rho }_f$, the resistivity per unit concentration of Frenkel pairs.