Carbon-14, C-14, 14C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its presence in organic matter is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples.

碳-14的 原子核 由6个 质子 和8个 中子 构成，其 半衰期 約為5,730±40年，衰變方式為 β衰變，衰變过程中，碳-14原子轉變為 氮-14 原子。 在地球上有99%的碳以碳-12的形式存在，其次约1%的碳以碳-13的形式存在，而只有萬億分之一（0.0000000001%）的碳-14存在于大气中。 1940年代， 威拉得·利比 在美国 芝加哥大学 利用碳-14的特性发明了 放射性碳定年法，并于1960年获得 诺贝尔化学奖 [3][4][5] 。 由于有机材料中含有碳-14，因此根据它可以确定考古学、地质学和水 …

2021年10月14日 · Carbon C-14 is an unstable isotope of carbon created when a neutron collides with a nitrogen atom, causing capture of the neutron and release of the proton converting nitrogen to a carbon with fourteen nucleons (6 protons and 8 neutrons). Carbon-14 emits beta particles as it decays and reverts back to nitrogen.

2025年2月20日 · carbon-14, the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts. The carbon-14 nucleus has six protons and eight neutrons, for an atomic mass of 14. The isotope also is used as a tracer in following the course of particular carbon atoms through chemical or biological transformations.

2023年10月20日 · Carbon-14 dating works by comparing the ratio of carbon-12 to carbon-14 in a sample to that in a living organism, allowing for the determination of the age of formerly living things fairly precisely.

Carbon-14 is a radioisotope of the chemical element carbon, which has 8 neutrons in its atomic nucleus in addition to the element-specific 6 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 14.

Carbon-14 is also called “carbon 14” or “radiocarbon”, or in symbols: 14 C, or 146 C, or C 14. Carbon 14 is the only radioactive isotope of carbon found in nature. It is generated in the Earth’s atmosphere by Cosmic rays and decays with a Half-life of about 5700 years. This long half life makes Carbon 14 exist for enough time to be detected.

Carbon-14 is generated in the atmosphere on interaction of cosmic rays with atmospheric nitrogen and is rapidly oxidized to a state of 14 CO 2. As a result, an equilibrium concentration is established. In preindustrial period, the concentration ratio 14 C/ 12 C was equal to 1.2·10 −12.

2024年11月3日 · Summary: Carbon-14 (C-14) is a radioactive isotope of carbon that plays a pivotal role in various scientific fields, particularly in archaeology and environmental science. This article explores the formation, properties, applications, and significance of carbon-14 and how it is used for radiocarbon dating, the natural processes that sustain it ...

OT to generate 14CO2 gas which could be inhaled. There are 3 main classes of carbon compounds: organic compounds, gases (CO or CO2), and aerosols of carbon cont. ining compounds such as carbonates and carbides. Most organic compounds are NOT very volatile under normal circumstances and the probability of .