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It is widely used in dating fossils or archaeological samples containing organic material such as wood, charcoal, bone, shells, etc.
It is not used to date rocks or other inorganic material.
In most cases, the three methods produced similar results.
Surprisingly, in at least one case the date range given by There may be other examples of systematic variation in isotope decay rates.
Carbon-14 dating does not produce ages in the millions of years, as do some other types of radioisotope dating.
C dating consists of measuring the amounts of carbon-14 and carbon-12, and sometimes C-13, in a sample.
A final assumption is that the various rates of flow of carbon-14 among the respective geophysical reservoirs must be constant, and the residence time of carbon-14 in the various reservoirs must be short relative to its half-life. (Riverside, CA: La Sierra University Press, 1997), 183. Carbon-14 dating models and experimental implications. Origins 24(2, 1997):50-64  The deep ocean waters are estimated to take about 1000 years to circulate back to the surface: Aitken, MJ.
If these three conditions are met, the initial concentration of C in the sample can be estimated.
Carbon-14 dating depends on the amount of atmospheric carbon-14 relative to carbon-12. This ratio would have been different before the Flood. According to these authors, the total mobile (non-carbonate) carbon in the biosphere is about 40,000-45,000 gigatons. The global carbon cycle: a test of our knowledge of Earth as a system. The earth’s sediments contain a vast amount of carbon-12 in the form of coal and oil.  Post WM, Peng TH, Emanuel WR, King AW, Dale VH, Deangelis DL. The amount of carbon in fossil fuels is estimated at 6,000 gigatons, and the amount of kerogens (organic) in sediments is about 15 million gigatons. Violations in the atmosphere result from volcanic eruptions that occasionally add C.Also, there is a lag time for atmospheric mixing in the northern and southern hemispheres which results in somewhat different ages for the two hemispheres.