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Carbon-14 dating cannot be applied to materials that have no C dates are less than that figure.
It is sometimes thought possible to extend the dating range a few half-lives, so one occasionally sees dates as old as 70,000 years or more.
C results for diamond samples on this site in 2007 (included below). Bertsche later posted a revision of his first critique at also at included the following claims regarding the Taylor and Southon have also measured unprocessed diamond, finding a similar range of 0.005 to 0.03 p MC [percent Modern Carbon] without background subtraction.
They interpret this result as their instrument background, primarily due to ion source memory.
Old-earth creationist Kirk Bertsche has been critical of the RATE work on Carbon-14 dating diamonds, which indicate that they are not billions of years old, but less than 56,000 years (with evolutionary assumptions) and less than 7000 years old (with the correct biblical assumptions).
Kirk Bertsche writes, The ICR (Institute for Creation Research) recently spent eight years on a project known as RATE (Radioisotopes and the Age of The Earth).
Carbon dating has a certain margin of error, usually depending on the age and material of the sample used.
For these samples, other dating methods must be used.The level of atmospheric Radiometric dating in general, of course, poses a huge problem for people who believe that the universe is 6000-odd years old.A favorite tactic of Young-Earthers involves citing studies which show trace amounts of Indeed, this results from a unique decay mode known as "cluster decay" where a given isotope emits a particle heavier than an alpha particle (radium-226 is an example.) This fact is extremely inconvenient to them, and creationist literature, accordingly, usually does not mention it.Furthermore, if a sample has been contaminated, scientists will know about it.Ironically, given how supposedly useless carbon dating is claimed to be, Creation Ministries International rests part of their "101 Evidences" on carbon dating being a useful method for within several thousand years.