So the assumption that all the produced argon will remain trapped in the rock is almost certainly wrong.
How do scientists find the age of planets date samples or planetary time relative age and absolute age?
So whilst isochron dating can give a straight line, the slope may have no significance [Vardiman et al].
The assumptions of initial conditions, rates, and closed-ness of the system are involved in all scientific attempts to estimate age of just about anything whose origin was not observed.
Description: The relatively large amount of helium produced in rocks may make it possible to extend helium dating to rocks and minerals as young as a few tens of thousands of years old. The clash between OE dating millions or billions of years and YE dating thousands of years centres on the decay constant K.