If the magnetic field is high, more cosmic rays are deflected away from the Earth and the production of radiocarbon falls.
Half-lives vary according to the isotope, for example, Uranium-238 has a half-life of 4500 million years where as Nitrogen-17 has a half-life of 4.
This means that after 5,730 years half of the total amount of radiocarbon in a dead body disintegrates.
So, scientists can estimate the age of the fossil by looking at the level of decay in its radioactive carbon.
After this point, although the amount of carbon-12 remains constant, carbon-14 continues to disintegrate and the ratio starts to decrease after the body dies. Lewis' owner, Ruth Cisero, claimed that her cat only attacked because he was under a lot of stress from being tormented by egg- and water-throwing neighbors. aboit He also spray painted "April Fool" in 50 foot letters around the rim.When the sun’s rays reach them, a few of these particles turn into carbon 14 (a radioactive carbon).Within this cycle, radioactive carbon-14 is continuously created and disintegrated.
Consequently, the ages determined by the radiocarbon method are not taken seriously by archeologists because of the problems in the basic assumptions upon which the method was established.