Talk:Isotopes of radium

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About the actinides and fission products by decay chain thingy

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

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

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

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

129.104.241.231 (talk) 00:51, 27 September 2024 (UTC)

I just realized that ²¹⁸Ra and ²²⁰Ra are more likely to undergo ¹²C (rather than ¹⁴C) emission: their Q_¹²C values are higher than Q_¹⁴C values. (Ignoring ⁸Be emission of ²¹⁸Ra.) 129.104.244.113 (talk) 04:37, 11 June 2025 (UTC)