carbon-12

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carbon-12

[′kär·bən ′twelv]
(nuclear physics)
A stable isotope of carbon with mass number of 12, forming about 98.9% of natural carbon; used as the basis of the newer scale of atomic masses, having an atomic mass of exactly 12u (relative nuclidic mass unit) by definition.
References in periodicals archive ?
On the design and engineering front, Dawson noted, there have been plenty of lessons learned from PATH Architecture's experience with Carbon 12 to apply to The Canyons.
F R I D AY BRECON: Theatr Brycheiniog (01874 611622), Welsh National Opera presents Carbon 12.
Carbon 12 is part of a night also featuring a score by Alexander Nevsky on Thursday with other WNO productions of Aida, Hansel and Gretel and An Evening With Rossini playing at the venue between Tuesday and Saturday.
Artificial norandrosterone contains lower levels of carbon 13 than carbon 12, because it is produced from a plant source with less carbon 13 than normal dietary sources.
Plants absorb this C[O.sub.2], and, as long as they are alive, the ratio of carbon 14 to carbon 12 within the plants is constant.
Price and ARS chemist Suzie Sheng are using mass-spectrometry analysis to compare the ratio of carbon 12 and 13 isotopes of sugars that have been metabolized and secreted into saliva.
Here, he compares the ratio of carbon 13 to carbon 12 isotopes.
Because of the deviation of atomic masses from the integral value (except carbon 12), different elemental compositions that have the same nominal mass differ slightly in actual mass.
Important evidence is contained in the ratios of the carbon 12 and 13 isotopes in the cap carbonates.
For example, tests will discover whether rocks contain traces of Carbon 12 which is created from biological matter.
The lightest is carbon 12, followed by carbon 1 3 and radioactive carbon 14 (radiocarbon).
Working at the Joint Institute for Nuclear Studies in Dubna, USSR, they irradiated a nuclear emulsion with energetic carbon 12 nuclei.