How does carbon dating work
Thus the earth's atmosphere couldn't be any older than this.
Efforts to salvage carbon dating are many and varied, with calibration curves attempting to bring the C-14 "dates" in line with historical dates, but these produce predictably unreliable results.
It is only useful for once-living things which still contain carbon, like flesh or bone or wood.
Rocks and fossils, consisting only of inorganic minerals, cannot be dated by this scheme.
It takes another 5,730 for half of the remainder to decay, and then another 5,730 for half of what's left then to decay and so on.
The period of time that it takes for half of a sample to decay is called a "half-life."Radiocarbon oxidizes (that is, it combines with oxygen) and enters the biosphere through natural processes like breathing and eating.
The changing ratio of C-12 to C-14 indicates the length of time since the tree stopped absorbing carbon, i.e., the time of its death.
We have to assume, for example, that the rate of decay (that is, a 5,730 year half-life) has remained constant throughout the unobservable past.Plants and animals naturally incorporate both the abundant C-12 isotope and the much rarer radiocarbon isotope into their tissues in about the same proportions as the two occur in the atmosphere during their lifetimes.