Radionuclide
Radionuclide
Atom that has excess nuclear energy, making it unstable.
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Readers' pathsAug 2026 – Oct 2026
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Nuclide
Atomic species.
21%
Radioactive decay
Emissions from unstable atomic nuclei.
12%
Bismuth
Chemical element with atomic number 83 (Bi).
5.1%
Ionizing radiation
Harmful high-frequency radiation.
4.8%
Bismuth-209
Isotope of bismuth.
4.7%
Decay chain
Series of radioactive decays.
4.2%
Tritium
Isotope of hydrogen with two neutrons.
4.1%
Radiation
Waves or particles moving through space.
3.7%
Half-life
Time for exponential decay to remove half of a quantity.
2.3%
Technetium
Chemical element with atomic number 43 (Tc).
1.9%
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Chernobyl disaster
1986 nuclear accident in the Soviet Union.
7.8%
Radioactive decay
Emissions from unstable atomic nuclei.
5.9%
Radioactive waste
Unusable radioactive materials.
4.8%
Carbon-14
Radiosotope of carbon.
4.7%
Carbon
Chemical element with atomic number 6 (C).
3.9%
Nuclear fallout
Residual radioactive material following a nuclear blast.
3.3%
Low-background steel
Steel produced prior to the 1940s.
3.2%
Radium
Chemical element with atomic number 88 (Ra).
2.8%
Vela incident
1979 undeclared nuclear explosion.
2.2%
Radiological warfare
Attacks using radioactive material with intent of contamination of an area.
2%