It is used in dating things such as bone, cloth, wood and plant fibers that were created in the relatively recent past by human activities.
Carbon dating is used to determine the age of biological artifacts up to 50,000 years old.
From Strange Attraction: The Mystery of Magnetism on the Guatamalan magnetic sculptures, “One of them, for example, which is now in front of the little museum at La Democracia, Guatemala, bears a strong likeness to F. R., lorgnette eyeglasses and all.” Shall I add this quote to my Ancient Optics post?
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Also, many fossils are contaminated with carbon from the environment during collection or preservation procedures.
Scientists attempt to check the accuracy of carbon dating by comparing carbon dating data to data from other dating methods.
Scientists now realize that production of carbon-14 has not been constant over the years, but has changed as the radiation from the sun has fluctuated.
Nuclear tests, nuclear reactors and the use of nuclear weapons have also changed the composition of radioisotopes in the air over the last few decades.
How do scientists know how old an object or human remains are?
What methods do they use and how do these methods work?
All four of the heads have a north magnetic pole located in their right temples, while three of them have south magnetic poles below the right ear and the fourth (that in front of the museum) has a south magnetic pole in its left temple, Such a pattern of occurrence is unlikely to be a matter of chance, even in a sample size as small as four.” Tell that to the biologists who see proof of a Designer every day! “One of the problems with this methodology is that it tells you the latest use of the sphere but it doesn’t tell you when it was made.
From Science Daily: “The KU researcher said that scientists believe the stones were first created around 600 A. These objects can be used for centuries and are still sitting where they are after a thousand years. UK “there are more than enough examples to show that stone itself was given a form of reverence in prehistory, and was likely seen as being endowed with ‘special’ qualities (as shown by the specific selection and transport of stone at Megaliths).
This restriction extends to animals that consume seafood in their diet.
As stated previously, carbon dating cannot be used on artifacts over about 50,000 years old.
Other methods scientists use include counting rock layers and tree rings.