Talk:Extinct radionuclide

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... [B]eryllium-10 [is] produced by cosmic ray spallation on dust in the upper atmosphere.

I'm not sure this is entirely accurate. What element acts as the parent for this spallation? If it is something between carbon and oxygen, it is possible that some of the spallation actually uses a gas as the parent and not dust. -- B.D.Mills  (T, C) 02:59, 12 May 2008 (UTC)