Actually, that ratio may have been quite different.
For example, a worldwide flood would uproot and bury preflood forests.
When granite rock hardens, it freezes radioactive elements in place.
Half of it will decay in about 5,730 years to form nitrogen.Half of the remainder will decay in another 5,730 years, and so on.However, before accepting any radiocarbon date, one should know how the technique works, its limitations, and its assumptions.One limitation is that the radiocarbon technique dates only material that was once part of an animal or plant, such as bones, flesh, or wood. To understand the other capabilities and limitations of radiocarbon dating, we must understand how it works and consider the flood. However, roughly one in a trillion carbon atoms weighs 14 atomic units. It is also called radio carbon because it is radio active (but not dangerous).If the atmosphere's ratio of carbon-14 to carbon-12 has doubled since the flood and we did not know it, radiocarbon ages of things living soon after the flood would appear to be one half-life (or 5,730 years) older than their true ages.
If that ratio quadrupled, organic remains would appear 11,460 (2 x 5,730) years older, etc.Outside the range of recorded history, calibration of the 14 clock is not possible.This means the above calculations are only evolution speculation and NOT backed up by real science.Therefore, a radiocarbon year would not correspond to an actual year.As explained in recent measurements show that the ratio of carbon-14 to carbon-12 has been building up in the atmosphere.This element is locked in tiny zircons within the granite. While it stays within the zircon for a period of time, being a very small atom, helium escapes the zircon within a few thousand years.