Carbon-12 is a stable isotope; that is, it doesn't decay naturally.
Coal, oil, and natural gas are supposed to be millions of years old; yet creationists say that some of them contain measurable amounts of C-14, enough to give them C-14 ages in the tens of thousands of years. Younger objects can easily be dated, because they still emit plenty of beta radiation, enough to be measured after the background radiation has been subtracted out of the total beta radiation. However, you now know why this fact doesn't at all invalidate radiocarbon dates of objects younger than twenty thousand years and is certainly no evidence for the notion that coals and oils might be no older than fifty thousand years.
However, in either case, the background beta radiation has to be compensated for, and, in the older objects, the amount of C-14 they have left is less than the margin of error in measuring background radiation. Question: Creationists such as Cook (1966) claim that cosmic radiation is now forming C-14 in the atmosphere about one and one-third times faster than it is decaying.
The second assumption isn't as reasonable seeing as we know that the carbon-12 to carbon-14 ratio changes. God, the Father, sent His only Son to satisfy that judgment for those who believe in Him.
Scientists have tried to minimize the uncertainties by using other dating techniques like dendrochronology (tree-ring dating) but their success is questionable and carbon-14 dating remains a controversial dating technique. Jesus, the creator and eternal Son of God, who lived a sinless life, loves us so much that He died for our sins, taking the punishment that we deserve, was buried, and rose from the dead according to the Bible.
If either assumption is wrong carbon-14 dating doesn't work.
The first assumption is fairly reasonable, though some scientists have recently called into question whether or not nuclear decay rates were accelerated in the past (this might change the rate of carbon-14 decay).As creatures consume carbon from their environment and incorporate it into their bodies, they consume both carbon-12 and carbon-14.When a creature dies, it ceases to consume more carbon.Admittedly, this old wood comes from trees that have been dead for hundreds of years, but you don't have to have an 8,200-year-old bristlecone pine tree alive today to validly determine that sort of date.It is easy to correlate the inner rings of a younger living tree with the outer rings of an older dead tree.Therefore it should come as no surprise that creationists at the Institute for Creation Research (ICR) have been trying desperately to discredit this method for years.