Thorium Th
Element 90 — in the list.
Identity
- Atomic number
- 90
- Symbol
- Th
- Most abundant neutron number
- 140
- Flow object
- fo-1fe0b0d0552af544
- Elementary flows
- 6
- PubChem
- https://pubchem.ncbi.nlm.nih.gov/element/90
Nuclides and ions
4 nuclides, 0 ionsA nuclide and an ion of an element are flow objects in their own right — Th and each of the records below are separate substances, resolved separately and characterised separately. What holds them together is a statement on the child naming this element as its parent, which is why they are drawn under it rather than beside it.
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Nuclides 4
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Half life 1.9125 y ± 0.0007. Decay α=100%; 20O=1.13e-11±2.2%. chemlin
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Half life 75.4 ky ± 0.3. Decay IS=0.02±0.2%; α=100%; SF<4e-12%; 24Ne=5.8e-11±1.3%. chemlin
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Half life 14.0 Gy ± 0.1. Decay IS=99.98±0.2%; α=100%; SF=1.1e-9±0.4%; 24Ne+26Ne<2.78e-10%; 2β- ?. chemlin
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Half life 24.107 d ± 0.024. Decay β-=100%; α ?. chemlin
32 further nuclides are known and are not in this list: they are too short-lived for an inventory to carry, and their absence is a decision rather than a gap.
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Nuclide detail
| Nuclide | Mass number | Half life | Decay modes | Bq/g |
|---|---|---|---|---|
| Thorium-228 | 228 | 1.9125 y ± 0.0007 | α=100%; 20O=1.13e-11±2.2% | 3.0345e+13 |
| Thorium-230 | 230 | 75.4 ky ± 0.3 | IS=0.02±0.2%; α=100%; SF<4e-12%; 24Ne=5.8e-11±1.3% | 7.6263e+08 |
| Thorium-232 | 232 | 14.0 Gy ± 0.1 | IS=99.98±0.2%; α=100%; SF=1.1e-9±0.4%; 24Ne+26Ne<2.78e-10%; 2β- ? | 4,074.576678 |
| Thorium-234 | 234 | 24.107 d ± 0.024 | β-=100%; α ? | 8.5654e+14 |