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
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