Linked from
The 24 pages that link to Uranium-238, each with the reason it gives.
Enrichment of uraniumRelated: It is the principal isotope from which uranium-235 must be separated.
RadonRelated: Its decay chain produces radium-226 and ultimately radon-222.
GeoneutrinoRelated: Its decay chain produces a major share of Earth’s detectable geoneutrinos.
Depleted uraniumRelated: It makes up most depleted uranium and contributes to its high density.
NeptuniumRelated: Its neutron-capture chain is a major route to neptunium-239.
Breeder reactorRelated: Breeders can turn this abundant isotope into plutonium-239.