Yes, pretty much. E.g. Germany has loads of Sr-90 as a product of their fission power plants (typically PWRs fed with low-enriched uranium), at least some of w

Yes, pretty much. E.g. Germany has loads of Sr-90 as a product of their fission power plants (typically PWRs fed with low-enriched uranium), at least some of which is already vitrified in borosilicate glass along with the other high-activity waste and currently standing around to cool down so it can eventually be stuffed deep into probably a rock salt formation. It's not hard to separate it (and the Cs-137) from the rest of the spent fuel, if so desired.