The oldest nuclear reactor in the world
The Oklo site is a natural nuclear reactor found. It’s basically a spot where 2 billion years ago things added up and made what was basically a natural nuclear reactor. Thankfully its long gone but it’s still crazy the earth actually created something it took us centuries to create ourselves.
Formation and operation
Fuel source: About two billion years ago, the Oklo region had a rich deposit of uranium ore with a high concentration of uranium-235, the isotope necessary for nuclear fission.
Moderator: Groundwater in the area acted as a moderator, slowing down the fast neutrons released during fission. This slowing down allowed the neutrons to collide with other uranium-235 atoms, creating a sustainable chain reaction.
Cyclical process: The reaction would heat the water, causing it to boil and turn to steam. With no water to act as a moderator, the reaction would stop. As the area cooled, groundwater would return, and the cycle of fission would begin again.
Discovery
Discovery in 1972: French scientists discovered the Oklo natural reactors in 1972 after noticing a lower-than-expected concentration of uranium-235 in samples from the Oklo mine.
Evidence of the reaction: The deficit of uranium-235 was proof that nuclear reactions had occurred, confirming theories that such natural reactors could exist.
Number of reactors: Scientists have identified 16 separate zones within the Oklo and adjacent Okelobondo uranium mines that were part of this natural nuclear phenomenon.
Formation and operation
Fuel source: About two billion years ago, the Oklo region had a rich deposit of uranium ore with a high concentration of uranium-235, the isotope necessary for nuclear fission.
Moderator: Groundwater in the area acted as a moderator, slowing down the fast neutrons released during fission. This slowing down allowed the neutrons to collide with other uranium-235 atoms, creating a sustainable chain reaction.
Cyclical process: The reaction would heat the water, causing it to boil and turn to steam. With no water to act as a moderator, the reaction would stop. As the area cooled, groundwater would return, and the cycle of fission would begin again.
Discovery
Discovery in 1972: French scientists discovered the Oklo natural reactors in 1972 after noticing a lower-than-expected concentration of uranium-235 in samples from the Oklo mine.
Evidence of the reaction: The deficit of uranium-235 was proof that nuclear reactions had occurred, confirming theories that such natural reactors could exist.
Number of reactors: Scientists have identified 16 separate zones within the Oklo and adjacent Okelobondo uranium mines that were part of this natural nuclear phenomenon.
31-35, M
