Campbell provided in 2021 another of his earlier reports of possible interest, pursuant to his intent expressed in a recent publication (here). The relative abundance of potassium, uranium (and thorium) is considered by a few workers in the field to be of significant value in assessing the early chemical fractionation histories of the Moon and the Earth. Since the Apollo program has now been completed, abundant data are now available on the K-U systematics for lunar material and new data are available for the earth.
A review of this data together with an evaluation of previous interpretations is timely and could have considerable impact on the present knowledge of lunar-earth history. To this end, a compilation was made of all available potassium and uranium analyses on lunar samples returned by the American Apollo and the Soviet Luna exploration programs. Thorium analyses were also included as an analytical check on the reliability of the uranium analyses.
[A scan of the Google search results for "Potassium - Uranium Systematics on Moon samples" suggest there is ongoing interest in the subject (more)]
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