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Thorium-207 is a radioisotope of the chemical element thorium which, in addition to the element-specific 90 protons, has 117 neutrons in the atomic nucleus, resulting in the mass number 207. The very short-lived, only artificially producible, unstable and therefore radioactive nuclide has no practical significance; dealing with 207Th is for academic purposes only.
The first report on the production of Th-207 dates back to 2022. The synthesis was successful at the Heavy Ion Research Facility in Lanzhou (HIRFL), a research facility in China, in a gas-filled recoil separator (SHANS) by the fusion reaction between argon-36 and hafnium-176 [1].
The nuclide decays with a half-life of about 9.7 milliseconds, releasing an alpha particle to radium-203.
See also: list of Thorium isotopes.
Half-life T½ = 0.0097 s respectively 9.7 × 10-3 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
|---|---|---|---|---|
| α | 203Ra | 8,167(21) MeV |
| OZ | Isotone N = 117 | Isobar A = 207 |
|---|---|---|
| 71 | 188Lu | |
| 72 | 189Hf | |
| 73 | 190Ta | |
| 74 | 191W | |
| 75 | 192Re | |
| 76 | 193Os | |
| 77 | 194Ir | |
| 78 | 195Pt | 207Pt |
| 79 | 196Au | 207Au |
| 80 | 197Hg | 207Hg |
| 81 | 198Tl | 207Tl |
| 82 | 199Pb | 207Pb |
| 83 | 200Bi | 207Bi |
| 84 | 201Po | 207Po |
| 85 | 202At | 207At |
| 86 | 203Rn | 207Rn |
| 87 | 204Fr | 207Fr |
| 88 | 205Ra | 207Ra |
| 89 | 206Ac | 207Ac |
| 90 | 207Th | 207Th |
[1] - H. B. Yang et al.:
New isotope 207Th and odd-even staggering in α-decay energies for nuclei with Z > 82 and N < 126.
In: Physical Review C, (2022), DOI 10.1103/PhysRevC.105.L051302.
Last update: 2022-12-16
Perma link: https://www.chemlin.org/isotope/thorium-207
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