this post was submitted on 27 May 2026
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So, from what I understand, living things maintain (or at least prior to the industrial revolution did maintain) a predictable ratio of C-14 to C-12. I'm not super familiar with the mechanics of this, I imagine it's a case of the amount of C-14 lost matching the rate it was replaced via respiration.
Once the organism dies, it stops controlling that ratio and we can measure the decay using a sample of the material.
I see! If so, that makes sense, but the mechanics of C14 accumulation would be curious to see.
I don't think it's that the plants are controlling the ratio. I think it's that more C14 is being made all the time. And it only gets mixed into plants when they are living. Specifically it looks like C14 based CO2 is made in the atmosphere and then consumed by plants.