Before revision: Removing 135Xe from neutron exposure also means that the reactor will produce more of the long-lived fission product 135Cs .
After revision: (but not necessarily mixed in the fuel salt, where the 30-year halflife 137Xe is produced, so these isotope waste-streams can be handled separately)Removing 135Xe from neutron exposure also means that the reactor will produce more of the long-lived fission product 135Cs .