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If those rocks really have been sitting around on the moon for billions of years, I suspect that the the wide range of physical and chemical processes which occurred over that time period had a much more profound effect on the uncertainty of the age determination.
This is best illustrated by the radioactive age of a sample of diamonds from Zaire.
A helium balloon, for example, will deflate over time, because the helium atoms diffuse through the balloon and into the surrounding air.
Well, diffusion depends on the mass of the thing that is diffusing. Hayes has brought it up, we can take it into account, right?
However, it’s important to note that some radioactive dates (like those that come from carbon-14) don’t use the isochron method, so they aren’t affected by this particular flaw.
As a young-earth creationist, I look at this issue in a different way.
Was Rb-87 or Sr-87 added to the rock by some unknown process?
Was one of them removed from the rock by some unknown process?
The elements rubidium and strontium are found in many rocks. As illustrated above, a neutron in a Rb-87 atom can eject an electron (often called a beta particle), which has a negative charge. We know how long it takes Rb-87 to turn into Sr-87, so in principle, if we analyze the amount of Rb-87 and Sr-87 in a rock, we should be able to tell how long the decay has been occurring.It refers to one specific source of error – the uncertainty in the measurement of the amounts of various atoms used in the analysis.Most likely, that is the least important source of error.That’s just over half a percent error in something that is supposedly multiple billions of years old.Of course, that error estimate is complete nonsense.