Carbon-13 - 13 C or C-13 - is a natural, stable isotope of the chemical element carbon, whose atomic nucleus consists of six protons and seven neutrons. As one of the environmental isotopes, it accounts for about 1.1% of all natural carbon on Earth.

2024年2月10日 · 13C isotope signal in the atmosphere, scientists use specialized equipment like isotope ratio mass spectrometers. These instruments can collect air samples and analyze the stable isotopes present, including 13C, to determine their concentration and ratio relative to other isotopes like 12C.

2024年9月5日 · One critical product is 13 C urea used in the detection of H. pylori infections in humans. H. pylori is widespread throughout the world and can lead to stomach ulcers and stomach cancer. 13 C urea provides a low-cost detection method to allow for treatment and elimination of H. pylori.

2025年2月5日 · On a mass spectrum, the carbon 13 isotope peak appears at approximately one mass unit higher (the actual mass delta 1.00335) than the carbon 12 ion peak. The intensity of these isotopes is proportional to the relative abundance of the naturally occurring isotopes.

Cambridge Isotope Laboratories, Inc. (CIL), the world leader in stable isotope chemistry and the separation of carbon-13 (13 C), recently completed a significant expansion of its 13 C separation facility.

2023年8月29日 · The chance that a molecule in a sample contains a 13 C atom is related to the number of carbons present. If there is just one carbon atom in the molecule, it has a 1% chance of being a 13 C. That means the M+1 peak would be only …

2020年12月16日 · Cambridge Isotope Laboratories, Inc. (CIL), the world leader in stable isotope chemistry and the separation of carbon-13 (13 C), recently began a significant capacity optimization of one of the production cascades at the 13 C separation facility in Xenia, OH.

At a local scale, δ 13 C measurements show how much of the seasonal fluctuations are controlled by the terrestrial biosphere versus oceanic exchange. The differences among sites are best exemplified by comparing a sample site located in Barrow, Alaska with the South Pole air …

2021年11月22日 · The most important applications of the carbon-13 isotope are in medicine and in the diagnosis of metabolic diseases such as oncology, as well as in determining the structure of organic matter. Carbon-13 isotope is widely used in physics and …

Pools with relatively more 13 C (less 12 C) are called “heavy” and those with less 13 C are called “light”. Let's look at the four main carbon pools with which climate scientists are concerned: the atmosphere, the terrestrial biosphere (land plants, animals, and soils), fossil fuels, and the ocean.