Carbon-14 is the parent isotope, its constant decay rate is about 5730 years.Which means it takes that many years for it to decay to a stable daughter Nitrogen-14.Furthermore, different types of plants discriminate differently.This also has to be corrected for. Second, the ratio of C in the atmosphere at that time to be estimated, and so partial calibration of the “clock” is possible.The amount of cosmic rays reaching the Earth varies with the sun's activity, and with the Earth's passage through magnetic clouds as the solar system travels around the Milky Way galaxy.The strength of the Earth's magnetic field affects the amount of cosmic rays entering the atmosphere.Obviously, this works only for things which were once living.It cannot be used to date volcanic rocks, for example.
Carbon-14 can only be used to date something that was once living and under 50,000 years.
People wonder how millions of years could be squeezed into the biblical account of history. Christians, by definition, take the statements of Jesus Christ seriously.
Clearly, such huge time periods cannot be fitted into the Bible without compromising what the Bible says about the goodness of God and the origin of sin, death and suffering—the reason Jesus came into the world (See Six Days? He said, This only makes sense with a time-line beginning with the creation week thousands of years ago.
Answer The method of radioactive dating used for the Turin Shroud was 'radiocarbon dating' and was invented by Willard Libby.
C) dating usually want to know about the radiometric dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years.