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A very small amount of plutonium is found in nature. The majority of it is produced artificially.

The majority of plutonium is made in nuclear reactors:

  1. uranium-238 captures a neutron, becoming uranium-239
  2. uranium-239 undergoes beta decay, becoming neptunium-239 (halflife 23.5 minutes)
  3. neptunium-239 undergoes beta decay, becoming plutonium-239 (halflife 2.33 days)
  4. plutonium is then chemically separated from the remaining uranium, neptunium, etc.
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8y ago

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