Radiometric dating daughter isotope picturedating
It is an accurate way to date specific geologic events.There are many radiometric clocks and when applied to appropriate materials, the dating can be very accurate.If you subtract this from the total amount of daughter isotope that you measure in the sample, you have the amount of daughter isotope due to radioactive decay since solidification, which tells you the time since solidification.
The ratio of the parent to daughter then can be used to back-calculate the age of that rock. The reason we know that radiometric dating works so well is because we can use several different isotope systems (for example, Uranium-Lead, Lutetium-Halfnium, Potassium-Argon) on the same rock, and they all come up with the same age.
Shouldn't the radioactive elements have been decaying for 8 billion, 12 billion years; ever since they were blasted into existence in ancient supernovae?
In the solid state, everything is pretty well locked into place, so that relatively few particles can escape.
This ratio will be the same for any material in equilibrium, so it was the ratio in the sample when it solidified.
You would then measure the amount of isotope B in your meteorite (or whatever), and multiply it by the equilibrium ratio, yielding the amount of daughter isotope at solidification.
Radiometric dating is the use of radioactive and radiogenic (those formed from the decay of radioactive parents) isotopes (isotopes are atoms of the same element that have different numbers of neutrons in their nuclei) to determine the age of something.