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Subcritical reactor
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== Natural == Generally the term "subcritical reactor" is reserved for artificial systems, but natural systems do exist—any natural source of fissile material exposed to cosmic and gamma rays (from [https://www.quantamagazine.org/gamma-ray-data-reveal-surprises-about-the-sun-20190501/ even the sun]) could be considered a subcritical reactor. This includes space launched satellites with [[radioisotope thermoelectric generator]]s as well as any such exposed reservoirs.
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