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Science

eppur_se_muova

(39,067 posts)

2. "Normal" isotopic abundance is 98.9 to 1.07%, C-12 vs C-13. C-14 only traces. Something's not right here.

Reply to Judi Lynn (Original post)

Sat Feb 8, 2025, 04:10 PM

Feb 2025

https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=C

Atomic Weights and Isotopic Compositions for Carbon
Isotope Relative
Atomic Mass Isotopic
Composition Standard
Atomic Weight Notes

6 C 12 12.0000000(00) 0.9893(8) [12.0096, 12.0116]
13 13.003 354 835 07(23) 0.0107(8)
14 14.003 241 9884(40)

NIST Physical Measurement LaboratoryAtomic Weights and Isotopic Compositions Main Page

According to the excerpt from the article, this sample appears to be substantially enriched in C-13, contradicting the conclusion. Suggests more data with more sig figs needed.

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Experts Discover Ancient Life Locked Inside a 2.5 Billion-Year-Old Ruby as a Residue [View all] Judi Lynn Feb 2025 OP

Fascinating JMCKUSICK Feb 2025 #1

"Normal" isotopic abundance is 98.9 to 1.07%, C-12 vs C-13. C-14 only traces. Something's not right here. eppur_se_muova Feb 2025 #2

I think this article has misread the press release muriel_volestrangler Feb 2025 #3

OK, thanks. Good data, good paper, bad journos (again) ? eppur_se_muova Feb 2025 #4

Beat me to it. One can see the effects of C13 natural abundance in the mass... NNadir Feb 2025 #5