GENERAL KNOWLEDGE

Detailed explanation-1: -The much more abundant uranium-238 does not undergo fission and therefore cannot be used as a fuel for nuclear reactors.

Detailed explanation-2: -Uranium is now used to power commercial nuclear reactors that produce electricity and to produce isotopes used for medical, industrial, and defense purposes around the world.

Detailed explanation-3: -Uranium-238 (238U or U-238) is the most common isotope of uranium found in nature, with a relative abundance of 99%. Unlike uranium-235, it is non-fissile, which means it cannot sustain a chain reaction in a thermal-neutron reactor.

Detailed explanation-4: -Thorium fuel is a bit harder to prepare. Thorium dioxide melts at 550 degrees higher temperatures than traditional Uranium dioxide, so very high temperatures are required to produce high-quality solid fuel. Additionally, Th is quite inert, making it difficult to chemically process.