Why, we have no radium salts whatever on Earth that we could use for that purpose.

Dilute solutions of radium salts were also made, meant to be used internally.

The Curies undertook the arduous task of separating out radium salt by differential crystallization.

In particular, dial painters no longer licked paint brushes to shape them (which caused some ingestion of radium salts).

Such as all the dirt of a large field ruined by one handful of radium salt.

After the Curies discovered radium as an element, they continued to purify it until they produced radium salt.

Where I need help is in understanding what the differences are in radium chloride, radium salt, and pure radium metal.

So "Radium Chloride" and "radium salts" are pretty synonymous.

Little of interest, but brought home some specimens Reed believes to be radium salts, or uranium at least.

Radithor, a solution of radium salts, which was claimed by its developer William J. A. Bailey to have curative properties.