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]

β- decay properties of ²²²Rn somehow resemble ²⁰²Pb

Decay process	Q_β (keV)	Spin change	Half-life (a)
²⁰²Pb → ²⁰²Tl	49.7	0⁺ → 2⁻ (ΔJ^Δπ = 2⁻)	5.25×10⁴
²²²Rn → ²²²Fr	24	0⁺ → 2⁻ (ΔJ^Δπ = 2⁻)	6.7×10⁴ − 2.4×10⁸

In theory, the branching ratio of beta decay of ²²²Rn should be at the order of 10^-6%, comparable of the branching ratio of alpha decay for ¹⁴⁵Pm (2.8×10^-7%) or ²¹⁰Pb (1.9×10^-6%). Perhaps a tiny beta decay branch among alpha decays is more difficult to observe than the other way around. 129.104.241.162 (talk) 03:26, 6 March 2024 (UTC)[reply]

Emanation symbol

β- decay properties of 222Rn somehow resemble 202Pb

β- decay properties of ²²²Rn somehow resemble ²⁰²Pb