two beta minus decays, resulting in the production of fissile U-233 . The spent fuel cycle with thorium will contain U-233, an isotope with a half-life of 160,000 years.   While, the burnt fuels are Thorium with Reactor-Grade Plutonium (RGPu), Thorium with Weapons-Grade Plutonium (WGPu) and Mixed Oxide fuel (MOX). Radioactive