How old is earth based on radiometric dating
Lord Kelvin and Clarence King calculated the length of time required for the Earth to cool from a white-hot liquid state; they eventually settled on 24 million years. Beta decay involves the ejection of a beta particle an electron from the nucleus.The scatter of the data in shows clearly that the sample has been an open system to 87Sr and perhaps to other isotopes as well and that no meaningful Rb-Sr age can be calculated from these data.Finally, correlation between different isotopic dating methods may be required to confirm the age of a sample. The fission tracks produced by this process are recorded in the plastic film.
Although changes in alpha and beta decay rates are theoretically possible, theory also predicts that such changes would be very small and thus would not affect dating methods.
Meteorites as the Final Answer to the Age of the Earth The problem with measuring the age of rocks on Earth is that the planet is under constant geological change.