RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY
Uranium nuclear weapons. Conceptual image of the radioactive element uranium as an explosive, representing its use in nuclear weapons. Shown here are the chemical symbol (U) and values for this element. Uranium-238, an actinide metal used as a nuclear fuel, contributes to the Earth's internal heat. It has a half-life of 4.5 billion years. Its nucleus decays by spontaneous fission or emitting an alpha particle to form thorium-234. Also shown here are this chemical element's atomic number (92) and its standard atomic weight (238.029).
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