Carbon dating laboratories
In some radioactive decay processes, such as for Uranium-238, once the U-238 isotope decays, there is a long series of other unstable isotopes before you finally come to a stable one that does not decay (Lead-206). This means that every 5,730 years, there will be half as many C-14 atoms.Some other radioactive isotopes of other elements have very short half-lives such as in minutes or even microseconds.Recent research from creationists has uncovered exciting evidence that the Earth is only several thousand years old, as the Bible implies, rather than 4.5 billion years old as evolutionary science says.
The rocks brought back to Earth from the Moon were dated with the Uranium/Lead technique and other techniques that used a variety of other radioactive elements.
So, the fact that Uranium has a half-life in billions of years says nothing about how old the Earth is in itself. Carbon-14 dating, often called radiocarbon dating, has been done for years and the techniques for it have been much refined.
To date an object with C-14, the concentrations of C-14, C-12, and other isotopes are measured as precisely as possible.
Carbon dating laboratories do not generally try to date a sample that is believed to be older than around 40,000 years.
Why not date objects all the way back to 90,000 years? E., now has strong evidence that what scientists generally assume is unexplained contaminants could be Carbon-14 that has not yet decayed since Creation or Noahs Flood.
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Everyone has heard of the term half-life, which has to do with how quickly or slowly a sample of a radioactive isotope decays.