The starting isotope is called the parent and the end-product is called the daughter.The time it takes for one half of the parent atoms to decay to the daughter atoms is called the half-life.However, there are many methods that can be used to determine the age of the earth or other objects.
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It is possible to measure the ratio of the different radioactive parent isotopes and their daughter isotopes in a rock, but the ratios are not dates or ages.
The dates must be inferred based on assumptions about the ratios.
Uniformitarian geologists use so-called dating methods to determine the ages of the surrounding rocks.
Certain types of rocks, especially those that form from magma (igneous), contain radioactive isotopes of different elements.
The Bible gives us a much more reliable history of the earth as it was recorded by God.
When someone mentions scientific dating methods, the first thing to come to mind for most people is carbon dating.Relative ages are assigned to rocks based on the idea that rock layers lower in the strata were deposited before rock layers that are higher.Creationists do not necessarily disagree with this concept, but it can only be applied to layers that are found in one location and/or can be determined to have been deposited in a continuous layer over a very wide area.The claimed “fact” that decay rates have always been constant is actually an inference based on a uniformitarian assumption.It is true that radioisotope decay rates are stable today and are not largely affected by external conditions like change in temperature and pressure, but that does not mean that the rate has always been constant.Some of the common isotope pairs used are K-Ar, Rb-Sr, Pb-Pb, and U-Pb.