Uranium-238

[fchichorro]

This one is a recurrent flow in PEF datasets

[bl-young]

Would you not consider this to be a synonym of Uranium, since it is the most common isotope by far?

https://github.com/USEPA/fedelemflowlist/blob/7f2550a383a026ade3d23c8b0e3f6d1ba411bdd3/fedelemflowlist/input/ChemicalsFlowables.csv#L3065