Plutonium (Pu)
Plutonium: The Powerhouse Element
Plutonium is a silvery, radioactive metal and one of the most significant transuranium elements (elements heavier than uranium). It is famous—and feared—for its role as both a fuel in nuclear reactors and a key ingredient in nuclear weapons. The name follows the planetary naming trend: uranium (Uranus), neptunium (Neptune), and then plutonium (Pluto).
Why Is Plutonium Useful?
Plutonium is so valuable because it can undergo nuclear fission, releasing enormous amounts of energy.
Nuclear Weapons: The isotope plutonium-239 is the main material used in nuclear bombs. Just 1 kilogram of plutonium can release energy equal to 10,000 tonnes of TNT if fully detonated.
Nuclear Energy: Plutonium is used as fuel in some nuclear power plants, often in the form of mixed oxide (MOX) fuel, which recycles plutonium produced in reactors.
Spacecraft Power: The isotope plutonium-238 generates heat as it decays, which is converted into electricity by radioisotope thermoelectric generators (RTGs). These power spacecraft such as the Mars Curiosity Rover and New Horizons, especially where solar panels wouldn’t work far from the Sun.
Natural Abundance & History
Plutonium does not occur naturally in significant amounts. It is mainly produced by bombarding uranium-238 in nuclear reactors, which creates plutonium-239.
1940: At the University of California, Berkeley, a team led by Glenn Seaborg created plutonium by bombarding uranium-238 with deuterium nuclei.
1942: Scientists succeeded in producing plutonium in measurable amounts.
1945: Plutonium was produced on a large scale for the Manhattan Project. Three atomic bombs were built using plutonium—one of which was detonated over Nagasaki, Japan.
Biological Role
Plutonium has no role in living organisms. It is extremely toxic because of its strong radioactivity. If inhaled, it can damage the lungs, bones, and liver and remains dangerous for thousands of years.