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Neutrons that come from these fragmented atoms collide with 14N atoms the atmosphere is made mostly of nitrogen and oxygen and convert them into 14C atoms the neutron is accepted and a proton is ejected from the nucleus. These techniques are applied to igneous rocks, and are normally seen as giving the time since solidification.
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It is very much driven by the existing long-age world view that pervades academia today. We don't have all the answers, but we do have the sure testimony of the Word of God to the true history of the world.
However, radioisotope dating may not work so well in the future.
The smaller the ratio, the longer the organism has been dead. The numbers refer to the atomic weight, so Carbon has 6 protons and 6 neutrons, Carbon has 6 protons and 7 neutrons, and Carbon has 6 protons and 8 neutrons.
It is an unsolved mystery to evolutionists as to why coal has 14C in it, or wood supposedly millions of years old still has 14C present, but it makes perfect sense in a creationist world view.
Therefore, if we know the 14C: This instability makes it radioactive.
Therefore, the ratio of 14C to 12C in living creatures will be the same as in the atmosphere. Similar questions can also arise in applying Sm-Nd [samarium-neodymium] and U-Pb [uranium-lead] isochron methods.
Institute for Creation Research,pp. Half-lives vary according to the isotope, for example, Uranium has a half-life of million years where as Nitrogen has a half-life of 4.
Tree ring dating dendrochronology has been used in an attempt to extend the calibration of the calibration of carbon dating earlier than historical records allow, but this depends on temporal placement of fragments of wood from long dead trees using carbon dating, assuming straight-line extrapolation backwards.
Standard laboratories analyzed the isotopes. Overall, the energy of the Earth's magnetic field has been decreasing,  so more 14C is being produced now than in the past.
Why Is Radiocarbon Dating Important To Archaeology?
In fact, if a sample contains 14C, it is good evidence that it is not millions of years old. In fact, levels of Carbon have varied in the atmosphere through time. It must be noted though that radiocarbon dating results indicate when the organism was alive but not when a material from that organism was used.
It is simply that all observations must fit the prevailing paradigm.
C dating is only applicable to organic and some inorganic materials not applicable to metals. In recognition of this problem archaeologists have developed regional reservoir correction rates based on ocean bottom topography, water temperature, coastline shape and paired samples of terrestrial and marine objects found together in an archaeological feature such as a hearth.
Over time 14C decays to nitrogen 14N.