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Related Concept Videos

Radioactive Decay and Radiometric Dating02:48

Radioactive Decay and Radiometric Dating

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Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
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Global Climate Change01:50

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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The Carbon Cycle01:14

The Carbon Cycle

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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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Carbon-13 (¹³C) NMR: Overview01:10

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Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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Related Experiment Video

Updated: Jul 14, 2025

Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
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Making the case for an International Decade of Radiocarbon.

Timothy I Eglinton1, Heather D Graven2, Peter A Raymond3

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Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|October 9, 2023
PubMed
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Radiocarbon (14C) levels are decreasing due to fossil fuels and nuclear testing. Future measurements are crucial for understanding the carbon cycle and require international collaboration for a

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Anthropocenebomb 14Ccarbon cycleclimate changefossil fuelsradiocarbon (14C)

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Area of Science:

  • Earth and Environmental Sciences
  • Isotope Geochemistry
  • Atmospheric Chemistry

Background:

  • Radiocarbon (14C) is vital for tracking the global carbon cycle.
  • Anthropogenic activities, fossil fuel combustion, and nuclear weapons testing have significantly altered atmospheric 14C levels.
  • The 14C/12C ratio in atmospheric CO2 is currently below pre-industrial levels.

Purpose of the Study:

  • To highlight the dual impact of fossil fuel dilution and bomb 14C on the global carbon cycle.
  • To emphasize the need for a coordinated international 'decade of radiocarbon' to leverage increasing measurement capacity.
  • To outline key goals for future radiocarbon research, including filling observational gaps and enhancing observation networks.

Main Methods:

  • Analysis of historical and current radiocarbon (14C) data in atmospheric, land, and ocean reservoirs.
  • Utilizing bomb 14C as a tracer for air-sea gas exchange, carbon turnover, and transport processes.
  • Reviewing and proposing strategies for future radiocarbon research, including data synthesis and modeling.

Main Results:

  • Fossil fuel burning has progressively diluted atmospheric 14C.
  • Nuclear weapon tests introduced 'bomb' 14C, serving as a global tracer for carbon cycle processes.
  • The rate of future 14C decline depends on fossil fuel consumption and bomb 14C exchange.

Conclusions:

  • Coordinated international efforts are essential to maximize the utility of future radiocarbon measurements.
  • A 'decade of radiocarbon' is proposed to enhance observation networks, develop data tools, and establish metrics for carbon sinks.
  • Understanding and predicting future carbon cycle dynamics relies on continued and expanded radiocarbon monitoring.