Talk:Isotopes of cerium

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Nuclear bomb fallout?

Cerium141 was made in the Trinity nuclear bomb test, and could from what I watched only be produced by a nuclear explosion. It exposed Kodak film across the country from the processing plants. I notice the page now simply says half-life and that it's 'synthetic'.

Cristiano Toàn (talk) 02:56, 24 April 2023 (UTC)Cerium-136 decays by electron capture to Barium-136 (Cerium-136 atomic mass 135.907172, Barium-136 atomic mass 135.9045759). Each Cerium-136 decays to barium-136 releases 2.418 MeV Cerium-138 decays by electron capture to Barium-138 (Cerium-138 atomic mass 137.905991, Barium-138 atomic mass 137.9052472). Each Cerium-138 decays to barium-138 releases 0.693 MeV

_Nagelfar (talk) 15:33, 1 October 2020 (UTC)

@Nagelfar: And it also has a note in the main table pointing out that Ce-141 is a fission product. Double sharp (talk) 18:52, 1 October 2020 (UTC)

Possible alpha decay of ^142,144,145Ce

According to [1], ¹⁴²Ce should have an alpha decay half-life at the order of 10²⁷ years. It is likely that its alpha decay is not ignorable compared to double beta decay: [2] gives the theoretical half-life of double beta decay at the order of 10²³ years. Given the predictions, N = 84 (double beta for ¹⁴²Ce), 85 (¹⁴⁵Nd), 87 (¹⁴⁹Sm), 105 (¹⁷⁷Hf), 106 (double beta for ¹⁷⁶Yb and alpha for ¹⁷⁸Hf) and 111 (¹⁸⁷Os) would have no isotones with half-life exceeding the currently known longest half-life: 2.2×10²⁴ years for ¹²⁸Te.

¹⁴⁴Ce and ¹⁴⁵Ce have respectively an alpha decay energy of 0.41 MeV and 0.20 MeV, which is quite low, so alpha decays may be possible but with half-lives very long: at the order of 10¹¹⁸ years for ¹⁴⁵Ce given by the Geiger-Nuttall law. 2A04:CEC0:1930:1F41:6CF4:C74A:1EC0:E0D8 (talk) 02:09, 17 November 2023 (UTC)