Talk:Radon-222
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Emanation symbol
[edit]One sometimes finds the symbol Em when this was the element's name; I wonder if it goes back to Rutherford? Double sharp (talk) 12:22, 3 February 2021 (UTC)
Comparison of three even-even nuclides with medium beta decay half-lives
[edit]| Decay process | Qβ (keV) | Spin change | Half-life (a) |
|---|---|---|---|
| 202Pb → 202Tl | 49.7 | 0+ → 2− (ΔJΔπ = 2−, 1 forbidden unique) | 5.25×104 |
| 222Rn → 222Fr | 24 | 0+ → 2− (ΔJΔπ = 2−, 1 forbidden unique) | 6.7×104−2.4×108 (predicted) |
| 250Cm → 250Bk | 37.7 | 0+ → 2− (ΔJΔπ = 2−, 1 forbidden unique) | 1.04×105 |
129.104.241.162 (talk) 03:26, 6 March 2024 (UTC)
- Note that 205Pb → 205Tl is a 5/2− → 1/2+ process, which is also 1 forbidden unique, with a Q value of 50.5 keV. But its EC half-life is 3 orders of magnitude higher than that of 202Pb... So there is really nothing certain regarding beta decays :) 103.166.228.86 (talk) 08:45, 1 September 2024 (UTC)
222Rn actually has extremely high N/Z ratio
[edit]Among known beta-stable nuclides, only 238U, 244Pu, 248Cm, 254Cf, 256Cf (beta-stability unconfirmed), and 260Fm (discovery unconfirmed) have higher N/Z ratio than 222Rn. It is a pity that 222Rn is much less stable then most less neutron-rich nuclides... 129.104.241.116 (talk) 04:10, 20 January 2025 (UTC)