1 and 14 nuclides can be used for dating cultural relics. This method is called radioactive dating because carbon 14 exists in the atmosphere and remains in animals through breathing. Because it is constantly produced and decayed, the ratio of carbon 12 to stable carbon remains unchanged. When animals die, metabolism stops, so carbon 14 decays and the ratio of carbon 12 changes, so it can be calculated by this ratio.
2. Carbon 14 is a radioactive isotope of carbon, which is produced by cosmic rays hitting nitrogen atoms in the air. The nucleus of carbon-14 consists of 6 protons and 8 neutrons. Its half-life is about 5730 40 years, and the decay mode is β decay, and the carbon 14 atom is transformed into nitrogen-14 atom.
3. Carbon 14 is an isotope of carbon, which is radioactive. There are three isotopes of carbon in nature, namely stable isotope carbon 12, carbon 13 and radioactive isotope carbon 14. The half-life of carbon 14 is 5730 years, which is mainly used in archaeology to determine the age of biological death, or as a tracer to label compounds in chemistry and life sciences to explore micro-motion.
4. Carbon-14 dating method can be divided into conventional carbon-14 dating method and accelerator mass spectrometry carbon-14 dating method. At that time, the conventional carbon-14 dating method was invented by Libby. Since 1950, the technology and application of this method have made remarkable progress in the world, but its limitations are also obvious, that is, a large number of samples must be used and a long measurement time is needed. Therefore, the accelerator mass spectrometry carbon-14 dating technique was developed.