Which category best describes Th-232 and Uranium-238 as fertile elements?

Which category best describes Th-232 and Uranium-238 as fertile elements?

• A. Naturally occurring
• B. Nuclear Fertile Elements
• C. Common fissionable fuels
• D. Fusion energy production

Answer: (B)

Fertile materials are capable of turning into fissile material after absorbing neutrons. Thorium-232 captures a neutron and becomes Th-233, which beta decays to U-233, a fissile isotope. Uranium-238 captures a neutron and becomes Np-239, which beta decays to Pu-239, also fissile. Because both can be converted into usable fissile fuel inside a reactor, they are described as fertile elements rather than direct fissionable fuels. They aren’t typically used as the primary fuels themselves, and they aren’t associated with fusion energy production. While they occur naturally, their defining role here is their ability to breed fissile material.

Fertile materials are capable of turning into fissile material after absorbing neutrons. Thorium-232 captures a neutron and becomes Th-233, which beta decays to U-233, a fissile isotope. Uranium-238 captures a neutron and becomes Np-239, which beta decays to Pu-239, also fissile. Because both can be converted into usable fissile fuel inside a reactor, they are described as fertile elements rather than direct fissionable fuels. They aren’t typically used as the primary fuels themselves, and they aren’t associated with fusion energy production. While they occur naturally, their defining role here is their ability to breed fissile material.