Isotope: Astatine-192
General data
| Element name | Astatine |
|---|---|
| Chemical symbol | At |
| Atomic number Z | 85 |
| Isotope name (symbol) | Astatine-192 (At-192) |
| Neutron number N | 107 |
| Mass number A=Z+N | 192 |
Ground state
| Half-life | 88 ± 6 ms |
|---|---|
| Spin / Parity | (9-) (10-) |
| Mass excess | 2930 ± 30 keV |
Decay branches
α 100% ECSF 0.5%Isomers
| Isomer | Energy | Half-life | Spin / Parity | Decay branches |
|---|---|---|---|---|
| Isomer 1 | - | 11.5 ± 0.6 ms | α 100% ECSF 0.5% |
Produced by decay of
NNDC data contain no decay that leads to this isotope.
Many isotopes are also produced, often mainly, in nuclear reactions (e.g. Co-60 from Co-59 by neutron capture, C-14 from nitrogen-14 in the atmosphere) and in fission (e.g. Cs-137, I-131) - those routes are not listed here.
Radioactive decay series
- Astatine-192 88 ms
- Bismuth-188 60 ms
- Thallium-184 9.5 s
- Mercury-184 30.9 s · 98.8%
- Gold-184 21 s · 97.7%
- Platinum-184 17.3 min · 97.7%
- Iridium-184 3.09 h · 97.7%
- Osmium-184 1.12×10¹³ a · 97.7%
- Gold-180 7.9 s · 1.2%
- Platinum-180 56 s · 2.3%
- Iridium-180 1.5 min · 2.3%
- Osmium-180 21.5 min · 2.3%
- Rhenium-180 2.46 min · 2.3%
- Tungsten-180 1.59×10¹⁸ a
- Osmium-176 3.6 min · 0.019%
- Rhenium-176 5.3 min · 0.019%
- Tungsten-176 2.5 h · 0.019%
- Tantalum-176 8.08 h · 0.019%
- Hafnium-176 stable
Rare branches (below 0.01%)
Rare branches are transformations that occur in fewer than 0.01% of decays, e.g. double beta decay or cluster emission. The nuclides they produce are practically absent from a sample, so they are hidden by default to keep the main path clear. In this series: branches - 1, nuclides - 7.
- Iridium-176 8.9 s · 0.0071%
- Rhenium-172 15 s · 2.2×10⁻⁴%
- Tungsten-172 6.6 min · 2.2×10⁻⁴%
- Tantalum-172 36.8 min · 2.2×10⁻⁴%
- Hafnium-172 1.87 a · 2.2×10⁻⁴%
- Lutetium-172 6.702 d · 2.2×10⁻⁴%
- Ytterbium-172 stable · 2.2×10⁻⁴%
Decay notation
| Notation | Name | On the chart | Description |
|---|---|---|---|
| α | alpha decay | Alpha decay is the emission of a helium nucleus (2 protons + 2 neutrons): Z−2, A−4. | |
| β⁻, 2β⁻ | beta-minus decay | In beta-minus decay a neutron turns into a proton and the nucleus emits an electron: Z+1, A unchanged. 2β⁻ is double beta decay. | |
| EC, EC/β⁺ | electron capture / beta-plus decay | A proton turns into a neutron: the nucleus captures a shell electron (EC) or emits a positron (β⁺): Z−1, A unchanged. | |
| p, 2p, 3p | proton emission | Proton emission is the ejection of a proton from the nucleus: Z−1, A−1. 2p, 3p - two, three protons. | |
| n, 2n…4n | neutron emission | Neutron emission is the ejection of a neutron from the nucleus: A−1, Z unchanged. 2n…4n - several neutrons. | |
| ¹⁴C, ²⁴Ne… | cluster emission | Cluster emission is the ejection of a light nucleus, e.g. ¹⁴C, ²⁰O, ²⁴Ne, ²⁸Mg, ³⁴Si. It is a very rare transformation. | |
| IT | isomeric transition | An isomeric transition takes a nucleus from an excited state (an isomer, e.g. Pa-234m) to the ground state, usually emitting a γ photon: Z and A unchanged. | |
| β⁻n, ECp, ECα… | delayed emission | Delayed emission is the emission of a particle (n, p or α) right after β⁻ decay or electron capture. The arrow has the colour of the emitted particle and its label shows the transformation, e.g. “β⁻n 63%”. | |
| SF | spontaneous fission | no arrow | Spontaneous fission is the splitting of a nucleus into two fragments of random masses. There is no single daughter, so the chart shows no arrow - it is listed in the decay branches and in the tile tooltip. |
Data sources
- NNDC Wallet Cards 2023 - Data as of 15 October 2024 - licence: Public domain