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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.
In this report, for example, we are told that using one radioactive dating technique, a lunar rock sample is 4,283 million years old, plus or minus 23 million years old.
In other words, there is a 95% certainty that the age is somewhere between 4,283 23 million years and 4,283 – 23 million years.
It refers to one specific source of error – the uncertainty in the measurement of the amounts of various atoms used in the analysis.
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.
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?
Most likely, the effect will be dependent on the age.
I would think that the older the sample, the larger the overestimate.