Critical mass
Critical mass
Smallest amount of fissile material needed to sustain a nuclear reaction.
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First pulled by Frognus, Nov 8, 2026
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Readers' pathsAug 2026 – Oct 2026
Readers go next to
Share of the 6,428 clicks on its links
Demon core
1945–1946 sphere of plutonium.
14%
Criticality accident
Uncontrolled nuclear fission chain reaction.
13%
Nuclear chain reaction
When one nuclear reaction causes more.
7%
Nuclear weapon design
5.4%
Fissile material
Material capable of sustaining a nuclear fission chain reaction.
5.3%
Uranium-232
Isotope of uranium.
2.8%
Pit (nuclear weapon)
Core of a nuclear implosion weapon.
2.5%
Neutron reflector
Material with the ability to reflect neutrons; used to control fission reactions.
2.4%
Californium
Chemical element with atomic number 98 (Cf).
2.3%
Gun-type fission weapon
Fission-based nuclear weapon.
1.9%
Readers come from
Share of the 9,167 readers arriving from another article
Demon core
1945–1946 sphere of plutonium.
33%
Harry Daghlian
American physicist (1921–1945).
10%
Louis Slotin
Canadian physicist and chemist (1910–1946).
5.3%
Criticality accident
Uncontrolled nuclear fission chain reaction.
4%
Nuclear weapon
2.8%
Nuclear fission
Reaction that splits an atomic nucleus.
2.8%
Plutonium-239
Isotope of plutonium.
2.8%
Cecil Kelley criticality accident
1958 nuclear accident at Los Alamos, New Mexico.
2.4%
Thermonuclear weapon
Multi-stage fusion-fission nuclear weapon.
2.1%
Plutonium-238
Isotope of plutonium.
2.1%