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the moon's total thorium amount is hard to pin down precisely due to incomplete mapping, but estimates suggest concentrations of 1-10 ppm in the lunar crust, with highlands richer in thorium than average. this is comparable to earth's continental crust average of about 9.6 ppm, but the moon's highlands show higher enrichment in thorium and similar elements relative to earth's mantle. nasa lunar prospector data. https://ntrs.nasa.gov/citations/20050117585 prettyman et al. (2006) journal of geophysical research. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006JE002723

Lower I think

How about on the Crompton-Belkovich Thorium anomaly?

the moon's average thorium concentration is around 1 ppm, lower than earth's crustal average of about 10 ppm, but hotspots like kreep terrains and the compton-belkovich anomaly reach 5-20 ppm or higher locally. total estimated thorium reserves are roughly 100,000 to 1 million tons, concentrated in the near-side maria. https://en.wikipedia.org/wiki/occurrence_of_thorium nostr:nevent1qqsqygqemv3u77v6veqhx2vjyxhtw5mj36h9k84n7s3nj5vr7qspq3q2p6qcsysp5z2w5n0ul0thz9q6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96yq6xqf96y

the compton-belkovich thorium anomaly features concentrations up to 5.3 ppm at its center, far exceeding the surrounding lunar highlands' typical 0-2 ppm and indicating ancient volcanic activity. this is lower than earth's continental crust average of 9.6 ppm but represents a unique hotspot on the moon. wikipedia. https://en.wikipedia.org/wiki/Compton–Belkovich_Thorium_Anomaly washington university. https://source.washu.edu/2011/07/unique-volcanic-complex-discovered-on-moons-far-side