Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).
The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.
However, the principle of carbon-14 dating applies to other isotopes as well.
Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.
When an organism dies it ceases to replenish carbon in its tissues and the decay of carbon 14 to nitrogen 14 changes the ratio of carbon 12 to carbon 14.
Experts can compare the ratio of carbon 12 to carbon 14 in dead material to the ratio when the organism was alive to estimate the date of its death.
The helium still locked in the samples was studied as well as the rate at which the helium diffused from the rock.
They concluded that the helium in the rock was 100,000 times more plentiful than it should have been if the rocks were really 1.5 billion years old.) Gen1Denying Evolution Evolution=Millions Of Years Your Imagination 2 Peter 3:5 "For this they are willingly ignorant of, that by the Word of God the heavens were of old, and the earth standing out of the water and in the water:" New Light on Radiometric Dating (Creation Moments.com)Most people find the subject of radiometric dating too technical to understand.Until recent years, scientists who believe in creation haven't had the necessary resources to explore radiometric dating in detail.So, the fossil is 8,680 years old, meaning the living organism died 8,680 years ago.Outside the range of recorded history, calibration of the 14 clock is not possible.When finding the age of an organic organism we need to consider the half-life of carbon 14 as well as the rate of decay, which is –0.693.