Relative Photo-Fission Cross Sections of Several Fissionable Materials

Abstract

Relative cross sections for the photo-fission of several fissionable elements have been measured using a "catcher" method. The results indicate the following cross sections with respect to ${\mathrm{U}}^{238}$: ${\mathrm{U}}^{233}$, 2.49; ${\mathrm{U}}^{235}$, 1.49; ${\mathrm{Pu}}^{239}$, 2.51; ${\mathrm{Th}}^{232}$, 0.257; and ${\mathrm{Io}}^{230}$, 0.847.