How to solve radiometric dating questions
Deep oceans, the biosphere, and carbonate rocks are giant reservoirs of carbon and with the addition of the atmosphere they constitute the carbon cycle of the Earth.
Within this cycle, radioactive carbon-14 is continuously created and disintegrated. Since the total amount of carbon on the Earth is constant, a constant ratio is established between the amount of stable and radioactive carbon.
In bodies less than 50,000 years in age the amount of radiocarbon can be detected.For an older body, the amount of radiocarbon is so small that the instruments would be unable to measure the amount of radiocarbon present.In addition, such a test obviously works only on the remains of things that were once alive, such as bones or wooden parts of an old structure.The most important ones are explained below: Changes in the Earth’s magnetic field are believed to be responsible for long-term deviations in radiocarbon dating.
By investigating the orientation of magnetic minerals in ancient rocks, geologists have proven that the magnetic field surrounding the Earth has not been constant throughout the time.
On the other hand, short-term variations show irregular fluctuations in the radiocarbon age from the real age.