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| Isotopes of Radium |
 Notes
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| Ra-224, Ra-226 and Ra-228 are all generated in the decay of either Uranium or Thorium. |
| Radium is over one million times more radioactive than the same mass of uranium. Radium loses about 1% of its activity in 25 years, being transformed into elements of lower atomic weight with lead being the final product of disintegration. |
 Notable Isotopes
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 223Ra [135 neutrons] |
 Abundance: ?
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| Half life: 11.43 days [ Alpha Decay ]
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| Decay Energy: 5.99MeV |
| Decays to 219Rn.
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| 224Ra [136 neutrons] |
| Abundance: ?
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| Half life: 3.6319 days [ Alpha Decay ]
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| Decay Energy: 5.789MeV |
| Decays to 220Rn.
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| 226Ra [138 neutrons] |
| Abundance: trace
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| Half life: 1602 years [ Alpha Decay ]
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| Decay Energy: 4.871MeV |
| Decays to 222Rn.
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| 228Ra [140 neutrons] |
| Abundance: Synthetic
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| Half life: 6.7 years [ beta- ]
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| Decay Energy: 0.046MeV |
| Decays to 228Ac.
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