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On the seventh day, god created uranium
(lemmy.zip)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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I don't think the burial matters. It's not random atoms that are turned into C14. It's specifically nitrogen. And I think those interactions mainly happen in the mid atmosphere with cosmic rays. So it's the atmosphere providing the shielding.
The Wikipedia page for this explains it pretty well, especially the Physical and Chemical Details section.
Thank you for the clarification