Isotope: Radon-195
General data
| Element name | Radon |
|---|---|
| Chemical symbol | Rn |
| Atomic number Z | 86 |
| Isotope name (symbol) | Radon-195 (Rn-195) |
| Neutron number N | 109 |
| Mass number A=Z+N | 195 |
Ground state
| Half-life | 6 +3/−2 ms |
|---|---|
| Spin / Parity | 3/2- |
| Mass excess | 5050 ± 50 keV |
Decay branches
α ≈ 100%Isomers
| Isomer | Energy | Half-life | Spin / Parity | Decay branches |
|---|---|---|---|---|
| Isomer 1 | 60 ± 50 keV | 5 +3/−2 ms | 13/2+ | α ≈ 100% |
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
- Radon-195 6 ms
- Polonium-191 22 ms
- Lead-187 15.2 s
- Thallium-187 ≈ 51 s · 90.5%
- Mercury-187 1.9 min · 90.5%
- Gold-187 8.3 min · 90.5%
- Platinum-187 2.35 h · 90.5%
- Iridium-187 10.5 h · 90.5%
- Osmium-187 stable · 90.5%
- Mercury-183 8.9 s · 9.5%
- Gold-183 42.8 s · 7.3%
- Platinum-183 6.5 min · 7.2%
- Iridium-183 58 min · 7.2%
- Osmium-183 13.0 h · 7.2%
- Rhenium-183 70.0 d · 7.2%
- Tungsten-183 stable · 7.2%
- Platinum-179 21.2 s · 2.2%
- Iridium-179 79 s · 2.3%
- Osmium-179 6.3 min · 2.3%
- Rhenium-179 19.5 min · 2.3%
- Tungsten-179 37.05 min · 2.3%
- Tantalum-179 1.82 a · 2.3%
- Hafnium-179 stable · 2.3%
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 - 2, nuclides - 16.
- Osmium-175 1.4 min · 0.0054%
- Rhenium-175 5.89 min · 0.0054%
- Tungsten-175 35.2 min · 0.0054%
- Tantalum-175 10.5 h · 0.0054%
- Hafnium-175 70.67 d · 0.0054%
- Lutetium-175 stable · 0.0054%
- Platinum-182 2.7 min · 2.5×10⁻⁵%
- Iridium-182 15 min · 2.5×10⁻⁵%
- Osmium-182 22.04 h · 2.5×10⁻⁵%
- Rhenium-182 64.2 h · 2.5×10⁻⁵%
- Tungsten-182 stable · 2.5×10⁻⁵%
- Osmium-178 5.0 min · 9.4×10⁻⁹%
- Rhenium-178 13.2 min · 9.4×10⁻⁹%
- Tungsten-178 21.6 d · 9.4×10⁻⁹%
- Tantalum-178 2.41 h · 9.4×10⁻⁹%
- Hafnium-178 stable · 9.4×10⁻⁹%
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