Nuclear Weapons Isotopes: Uranium and Plutonium
Nuclear weapons rely on specific isotopes that can sustain a nuclear chain reaction. The most common isotopes used as the primary fissile material in nuclear weapons are specific isotopes of Uranium and Plutonium.
- Uranium: Specifically, the isotope Uranium-235 (235U) is highly fissile and is a key component in many nuclear weapons. Natural uranium contains only about 0.7% 235U, so it must be enriched to increase the concentration of this isotope.
- Plutonium: Plutonium-239 (239Pu) is another crucial fissile isotope. It is produced artificially in nuclear reactors when Uranium-238 (238U) captures a neutron.
Other isotopes mentioned in the options play different roles:
- Deuterium: A heavy isotope of hydrogen, often used as fuel (in the form of lithium deuteride) in the secondary stages of thermonuclear (fusion) weapons, not as the primary fissile material.
- Lithium: Primarily Lithium-6 (6Li) is used in thermonuclear weapons, where it reacts with neutrons to produce tritium, which then fuels the fusion reaction. It is not a fissile material itself.
Therefore, Uranium and Plutonium are the principal isotopes utilized in the core of nuclear fission weapons.
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