Neutron cross section according to its neutron cross section and how it reacts to an incident neutron. Nuclides that tend to absorb a neutron and either decay or keep the neutron in its nucleus are neutron absorbers and will have a "capture cross section" for that reaction. Isotopes that fission, are fissionable fuels and have a corresponding "fission cross section". The remaining isotopes will simply scatter the neutron, and have a "scatter cross section". Some isotopes, like uranium-238, have nonzero cross sections of all three. Isotopes which have a large scatter cross section and a low mass are good neutron moderators (see chart
Papal Lateran Cross Papal Lateran Cross The Papal Lateran Cross () is a medal for recognition of merit bestowed by the Holy See. The Lateran Cross was commissioned by Pope Leo XIII, and instituted on February 18, 1903. The distinction was created as a recognition of merit, and is named in honor of the Basilica of St. John in Lateran in Rome. Initially, it was awarded for donations regarding the restoration of the Lateran Basilica. The distribution of the award was continued after the completion of the restoration process. Paul VI ended the awarding of the Lateran Cross in 1977. The decoration consists