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Barium. Vial containing a sample of the alkaline earth metal barium (Ba). Barium has few industrial applications. Barium sulphate is used for its density, insolubility, and X-ray opacity. It is used as an insoluble heavy additive to oil well drilling mud, and in purer form, as an X-ray radiocontrast agent for imaging the human gastrointestinal tract.
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