# Difference between revisions of "Human Produced Radionuclides"

From mn/safe/nukwik

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| Plutonium 239<br> | | Plutonium 239<br> | ||

| <sup>239</sup>Pu<br> | | <sup>239</sup>Pu<br> | ||

− | | 2.41 <math>\cdot</math> 10<sup>4</sup> | + | | 2.41 <math>\cdot</math> 10<sup>4</sup> a<br> |

| Produced by neutron bombardment of <sup>238</sup>U <br>( <sup>238</sup>U + n <math>\rightarrow</math><sup>239</sup>U<math>\rightarrow</math> <sup>239</sup>Np +ß<sup>-</sup> <math>\rightarrow</math><sup>239</sup>Pu+ß<sup>-</sup>) <br><br> | | Produced by neutron bombardment of <sup>238</sup>U <br>( <sup>238</sup>U + n <math>\rightarrow</math><sup>239</sup>U<math>\rightarrow</math> <sup>239</sup>Np +ß<sup>-</sup> <math>\rightarrow</math><sup>239</sup>Pu+ß<sup>-</sup>) <br><br> | ||

|} | |} |

## Revision as of 13:50, 28 June 2012

Written and developed by Prof. Tor Bjørnstad (IFE/UiO)

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Humans have used radioactivity for one hundred years, and through its use, added to the natural inventories. The amounts are small compared to the natural amounts discussed above, and due to the shorter half-lives of many of the nuclides, have seen a marked decrease since the halting of above-ground testing of nuclear weapons. Here are a few human produced or enhanced nuclides:

Human Produced Nuclides | |||

Nuclide |
Symbol |
Half-life |
Source |

Tritium |
^{3}H |
12.3 a |
Produced from weapons testing and fission reactors; reprocessing facilities, nuclear weapons manufacturing |

Iodine 131 |
^{131}I |
8.04 days |
Fission product produced from weapons testing and fission reactors, used in medical treatment of thyroid problems |

Iodine 129 |
^{129}I |
1.57 ^{7} a |
10 Fission product produced from weapons testing and fission reactors |

Cesium 137 |
^{137}Cs |
30.17 a |
Fission product produced from weapons testing and fission reactors |

Strontium 90 |
^{90}Sr |
28.78 a |
Fission product produced from weapons testing and fission reactors |

Technetium 99 |
^{99}Tc |
2.11 ^{5} a |
10 Decay product of 99Mo, used in medical diagnosis |

Plutonium 239 |
^{239}Pu |
2.41 ^{4} a |
10 Produced by neutron bombardment of ^{238}U ( ^{238}U + n ^{239}U ^{239}Np +ß^{-} ^{239}Pu+ß^{-}) |