10025-66-8

Yellowish-white crystals becoming yel- low or pink on standing. Radiactive. Soluble in water and alcohol.

In physical research. In radiography of metals because the penetration of gamma rays is more pronounced than that of x-rays. As source of radon. No longer used to make luminous paints.

As for radium.

Radium chloride, RaCl2, was the first radium compound to be prepared in a pure state and was the basis of Marie Curie’s original separation of radium from Barium. The first preparation of radium metal was by the electrolysis of a solution of radium chloride using a mercury cathode. The structure remains unknown. Radium chloride is soluble and crystallizes from solution as the dihydrate.
RaCl2 is used to produce radon gas that in turn is used as a cancer treatment in medicine. This compound is not offered for sale to the general public.

radium chloride is a white solid having a blue-green luminescence, especially when heated. It is less soluble in water than other alkaline earth chlorides, a fact which is used in the first stages of the separation of radium from barium by fractional crystallization. It is only sparingly soluble in azeotropic HCl (20.2% HCl) and virtually insoluble in concentrated hydrochloric acid.