Talk:Fission product yield

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The total sum of isotope yield is 45.5522% in all shown tables. Why is that-where is the rest 54.4478% gone? (talk) 07:15, 5 June 2008 (UTC)

The tables from IAEA are yield/fission, so should add up to about %200. But they are cumulative yield, so some decay to stable nuclides, and, it seems, don't count anymore. Gah4 (talk) 00:29, 17 November 2016 (UTC)

The table "Ordered by Yield" doesn't sort meaningfully by column Halflife. I tried experimenting with the approach documented in but without success. Any offers? Simon Marchese (talk) 22:57, 19 April 2011 (UTC)

I just added new IAEA tables, which don't have sort keys yet. Well, not the half life table yet. Gah4 (talk) 00:29, 17 November 2016 (UTC)
Hmm, that is a tough one, not sure.
These tables were some of the first I wrote on this subject in Wikipedia and are not complete. --JWB (talk) 06:09, 20 April 2011 (UTC)

"A few isotopes can be produced directly by fission, but not by beta decay because the would-be precursor with atomic number one greater is stable". Electron emission means the precursor has an atomic number one less. Is positron emission or electron absorption significant here? RTBoyce (talk) 13:06, 11 August 2011 (UTC)

(Comment on immediate and cumulative fission moved down below.)

Multiple tables[edit]

Why are there multiple tables? Shouldn't we have a single table that's sortable by multiple columns? OrangeDog (τ • ε) 12:54, 8 April 2014 (UTC)

It seems that there are multiple tables, sortable by multiple columns, some duplicated, some not. There is at least some redundancy left. Gah4 (talk) 23:43, 10 November 2016 (UTC)
But OK, there should be multiple tables. Seems to me that yields of U-235 and Pu-239 should have their own tables. Do we need both immediate and cumulative yield tables? Gah4 (talk) 06:04, 11 November 2016 (UTC)

Update data and reference[edit]

The fission yields are apparently sourced from [1], an unreferenced graph, and [2] a 1956 paper. It would be better to use values from a current compilation. I propose to update the data to IAEA cumulative yield tables from for thermal fission of U-235. Gierszep (talk) 02:25, 2 June 2015 (UTC)

Sounds good to me. Try to make one table with all the data, sortable by user selectable column. I came here interested in the source data for decay heat. It seems that these tables aren't so useful for that. Gah4 (talk) 23:46, 10 November 2016 (UTC)
OK, cumulative yields tables from IAEA for U-235 and Pu-239 are in. Does anyone want the independent yield tables? Or the tables for Th232, U-233, U-238, or Pu-241?
(And the IAEA Activation Product table is on the appropriate article for that one.)

Gah4 (talk) 23:58, 16 November 2016 (UTC)


independent or cumulative?[edit]

It seems that there are tables of both independent and cumulative fission yields.[1] Which one is this article about? Gah4 (talk) 05:08, 11 November 2016 (UTC)

It seems that someone else asked this earlier, moved down from above: Gah4 (talk) 06:10, 11 November 2016 (UTC)

This whole page confuses immediate fission yield (i.e. which nuclei are the result of fragmentation of the original fissile parent) and radioactive decay (i.e. subsequent transmutation by beta, alpha, and electron capture, positron emission, etc) and neutron absorption. These are different processes. Perhaps the introductory paragraph could make that clear and refer readers to other wikipedia pages on those topics? The tables are woefully incomplete and, I fear inaccurate. Also, fission yields are a function of parent nucleus and incident neutron energy. These tables should make clear the particular case, e.g. U-235 fissioned by a 0.025eV (median room temperature) neutron. Cuhlik (talk) —Preceding undated comment added 22:53, 22 January 2013 (UTC)

One thought is separate articles for immediate and cumulative yield. Gah4 (talk) 06:10, 11 November 2016 (UTC)


  1. ^ "About “Independent” and “Cumulative” fission yields". JAEA. Retrieved 11 November 2016.