Talk:Radon-222

A fact from Radon-222 appeared on Wikipedia's Main Page in the Did you know column on 10 March 2019 (check views). The text of the entry was as follows:

Did you know... that radiation from radon-222 and its decay products is the second-leading cause of lung cancer in the United States after cigarette smoking?

A record of the entry may be seen at Wikipedia:Recent additions/2019/March. The nomination discussion and review may be seen at Template:Did you know nominations/Radon-222.

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Emanation symbol

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)[reply]

Comparison of three even-even nuclides with medium beta decay half-lives

Decay process	Q_β (keV)	Spin change	Half-life (a)
²⁰²Pb → ²⁰²Tl	49.7	0⁺ → 2⁻ (ΔJ^Δπ = 2⁻, 1 forbidden unique)	5.25×10⁴
²²²Rn → ²²²Fr	24	0⁺ → 2⁻ (ΔJ^Δπ = 2⁻, 1 forbidden unique)	6.7×10⁴−2.4×10⁸ (predicted)
²⁵⁰Cm → ²⁵⁰Bk	37.7	0⁺ → 2⁻ (ΔJ^Δπ = 2⁻, 1 forbidden unique)	1.04×10⁵

129.104.241.162 (talk) 03:26, 6 March 2024 (UTC)[reply]

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)[reply]