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The only problem is that we only know the number of daughter atoms now present, and some of those may have been present prior to the start of our clock. The reason for this is that Rb has become distributed unequally through the Earth over time.We can see how do deal with this if we take a particular case. For example the amount of Rb in mantle rocks is generally low, i.e. The mantle thus has a low If these two independent dates are the same, we say they are concordant.For example lavas dated by K-Ar that are historic in age, usually show 1 to 2 my old ages due to trapped Ar.Such trapped Ar is not problematical when the age of the rock is in hundreds of millions of years.Thus, if we start out with 1 gram of the parent isotope, after the passage of 1 half-life there will be 0.5 gram of the parent isotope left.
Theoretically, Creationism remains workable within a wide range of age estimates.A radioactive form of potassium is found in minute quantities in some rocks.It disintegrates at a measured rate into calcium and argon.Other methods must be used to estimate the age of rocks and minerals.Two of the most widely-known systems are the potassium-argon method and the uranium-lead method.