How do we know radiometric dating is accurate
For example, the C14 concentration in the atmosphere depends upon cosmic ray intensity.
The multiple checks verify that the rate of isotope decay does not change over time, and it verifies the accuracies of the methods.
Radiometric dating is the method for establishing the age of objects by measuring the levels of radioisotopes in the sample. It decays to nitrogen 14 with a half life of 5730 years.
Carbon 14 is created by cosmic rays in the upper atmosphere.
Argon/argon dating works using only the ratio of the concentration of the argon isotopes. For the purposes of this debate, "accurate" means that 95% of the dating errors are within 10% of the measured date, within the time span for which the isotope pair is utilized.
Since carbon dating depends upon variable cosmic ray intensity, a calibration curve is assumed to be applied to account for that.C14 is continually being created and decaying, leading to an equilibrium state in the atmosphere.