How does uranium-238 help us understand Earth's interior?

Uranium-238 plays a major role in shaping our understanding of Earth's interior through its radioactive properties and decay products. Because of its abundance and long half-life, it accounts for roughly 40 percent of the radioactive heat produced inside the planet. Additionally, its decay chain releases electron anti-neutrinos, creating a detectable geoneutrino signal that offers insight into planetary processes.

What we know

• Uranium-238 is responsible for approximately 40 percent of the radioactive heat produced within the Earth. [2]
• The uranium-238 decay chain contributes six electron anti-neutrinos per nucleus, generating a large detectable geoneutrino signal. [2]
• Uranium-238 has a half-life of 4.463 billion years, and uranium naturally occurs in low concentrations in rocks and soil. [2, 3]

Where to go next

• how it workedWhat are geoneutrinos and how are they detected?
• how we knowHow does radiometric dating determine the age of the Earth?
• the bigger pictureWhat are the physical and chemical properties of uranium?
• what caused itHow does radioactive decay generate heat inside planets?
• compared withHow do uranium-235 and uranium-238 differ in nuclear reactors?
• an unexpected connectionHow is radium linked to the decay of uranium?Natural radium does not exist as a primordial element on Earth, but occurs entirely through the radioactive decay chains of elements like uranium.

Sources

• [1]uranium-238 (Wikidata Q1148503) · CC0 1.0
• [2]Uranium-238 · CC BY-SA 4.0
• [3]Uranium · CC BY-SA 4.0
• [4]Radioactive waste · CC BY-SA 4.0
• [5]Alkaline earth metal · CC BY-SA 4.0