Talk:Isotopes of radium
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About the actinides and fission products by decay chain thingy
[edit]Radium is not an actinide. 24.115.255.37 (talk) 18:23, 2 January 2022 (UTC)
- See the footnote in the template. Radium indeed is not an actinide, but it occurs in the decay chains of thorium and uranium, and the listed isotopes (226
Ra
and 228
Ra
) have half-lives several orders of magnitude than any of their daughters until stable lead. ComplexRational (talk) 18:49, 2 January 2022 (UTC)
221Fr and 221Ra are the lightest known nuclide to undergo cluster decay
[edit]According to Cluster decay#Experiments, 221Fr and 221Ra are the nuclides with the lowest mass number that are known to undergo cluster decay (the page Isotopes of barium says that 114Ba is predicted to undergo cluster decay, but this is not observed). So I think this "lightest nuclide" property should be noted for one of 221Fr and 221Ra or both of them in the table of isotopes, like what has been done for 242Cm.
The known isotopes of radium that undergo cluster decay (221-224,226Ra) are all beta stable. 129.104.241.214 (talk) 00:57, 4 December 2023 (UTC)
- Noted for both of them. 221Fr has the lowest atomic number, and 221Ra is the lightest. Nucleus hydro elemon (talk) 14:24, 28 December 2023 (UTC)
Electron capture of 216Ra
[edit]NUBASE2020 says that the branching ratio of electron capture 216Ra is <1×10-8%, which means that the decay mode has never been observed, and an EC half-life not exceeding half an hour can be excluded. I do not think that we have a chance to observe the actual decay.
| Decay process | QEC (keV) | Spin change | Half-life (a) |
|---|---|---|---|
| 170Tm → 170Er | 313.99 | 1− → 0+ (ΔJΔπ = 1−, 1 forbidden non-unique) | 268.74 |
| 216Ra → 216Fr | 312.09 | 0+ → 1− (ΔJΔπ = 1−, 1 forbidden non-unique) | ? |
129.104.241.214 (talk) 13:31, 2 March 2024 (UTC)
14C emission energies of isotopes of radium
[edit]Many isotopes of radium suffer from 14C emission, so I'm making this table.
| Isotopes | 14C emission energy (MeV) | 14C emission partial half-life (y) |
|---|---|---|
| 202Ra | 24.00 | |
| 203Ra | 23.46 | |
| 204Ra | 23.45 | |
| 205Ra | 23.11 | |
| 206Ra | 23.10 | |
| 207Ra | 22.75 | |
| 208Ra | 22.90 | |
| 209Ra | 22.57 | |
| 210Ra | 22.79 | |
| 211Ra | 22.56 | |
| 212Ra | 22.86 | |
| 213Ra | 22.57 | |
| 214Ra | 23.33 | |
| 215Ra | 24.79 | |
| 216Ra | 26.21 | |
| 217Ra | 27.65 | |
| 218Ra | 28.74 | (beta-stable) |
| 219Ra | 30.14 | |
| 220Ra | 31.04 | (beta-stable) |
| 221Ra | 32.40 | (beta-stable) 7.39×104 |
| 222Ra | 33.05 | (beta-stable) 4.01×103 |
| 223Ra | 31.83 | (beta-stable) 4.89×107 |
| 224Ra | 30.54 | (beta-stable) 2.31×108 |
| 225Ra | 29.47 | |
| 226Ra | 28.20 | (beta-stable) 6.15×1013 |
| 227Ra | 27.36 | |
| 228Ra | 26.10 | |
| 229Ra | 25.20 | |
| 230Ra | 23.99 | |
| 231Ra | 23.12 | |
| 232Ra | 22.00 | |
| 233Ra | 21.12 | |
| 234Ra | 20.07 |