Wikipedia says: "There are about 339 naturally occurring nuclides on Earth,[1] of which 288 are primordial nuclides, meaning that they have existed since the solar system's formation"
Where did the other naturally occurring nuclides on Earth come from if they haven't existed since the solar system's formation?
Where did the other naturally occurring nuclides on Earth come from if they haven't existed since the solar system's formation?
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Some unstable isotopes which occur naturally (such as C-14, H-3, and Pu-239) are not primordial, as they must be constantly regenerated. This occurs by cosmic radiation or (rarely) by such processes as geonuclear transmutation. Other examples of common naturally-occurring but non-primordial nuclides are radon, polonium, and radium, which are all radiogenic nuclide daughters of uranium decay and are found in uranium ores.
Excerpt from wikipedia
Excerpt from wikipedia