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Sealed In Small Tubes: The radon is pumped from a idium solution and sealed in small tubes which :come highly radioactive. These radioactive ibes are used by the medical profession in radio-icrapy. Radon can be collected and used in lalyses for small quantities of radium. It has :en used also in studies of the chemical effects radiations of radioactive substances.
A recently developed method for separating radium and barium employs synthetic organic cation exchange. Another procedure, perfected in 1953, recovers radium from a prepared radium-barium chromate concentrate.
Radium is used solely for its radiations. The primary use is in medicine, where it has been found beneficial in the treatment of cancer. For this purpose the element may be used directly, sealed in tubes and needles ; or its gaseous decay product, radon, may be compressed into a small capsule.
After 10 recrystallizations there are a few parts of radium per thousand parts of barium as compared with a few parts of radium per million parts of barium in the original crystallization. Next the bromides from several batches are consolidated and repurified, and further crystallizations made until radium salts of the desired purity are obtained. The purity of the salts may vary from 95 to 99 per cent radium. They are usually sealed in small tubes to be measured and sold. Certain types of ore may require modifications of this process.
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