C-12 is stable, meaning it does not decay into other elements over time. It is formed when cosmic radiation strikes N-14 (Nitrogen), converting it into C-14, and it decays back into N-14, with a half-life of 5730 years, meaning that for any sample of C-14, half of it will decay back into N-14 every 5730 years.
These young-Earth creationists now argue that radioisotope decay has actually occurred, can be measured accurately, and that it would require billions of years at present rates to account for the current condition of the Earth.
The scientific community has been making those very arguments for decades.
The RATE team, however, because of their unshakable Biblical faith in a 6,000 year old Earth, rejects uniformitarianism (Humphreys 20) and argues that the rate of decay was greatly accelerated during the first two days of Creation Week and during the year-long Flood of Noah (De Young 200-151).
This paper examines the evidence RATE cites for believing that decay has been accelerated, the proposed mechanisms for that acceleration, and several difficulties with the theory.
From 1997–2005, a group of young-earth creationists conducted a study to determine how radioactive decay data comports with a young Earth (6,000 to 10,000 years old).
They concluded that if decay rates have remained constant then far too much decay has occurred over Earth’s history to fit into the few-thousand-year timescale.
Clicking on the heading takes the reader to an article at the Answers in Genesis (AIG) website which touts "exciting breakthroughs" that are purported to provide "powerful independent confirmatory evidence" for accelerated radioactive decay.
The supposed "breakthroughs" have to do with discovery of an apparent overabundance of helium in certain zircon samples and the detection of carbon-14 (14C) in diamond.
These studies provide strong evidence that Earth formed over 4.5 billion years ago.
Because a 4.5-billion-year-old Earth conflicts with a popular interpretation of Genesis (called the “calendar day” or “24-hour day”), a group of scientists adhering to this interpretation decided to study the validity of radioisotope dating in order to assess how it might comport with a 6,000- to 10,000-year-old Earth.
These reviewers are motivated solely by the desire to defend their sacrosanct religious beliefs, not by the desire to discover the the scientific truth.