Which compound is used in medicine as barium meal for intestinal x-ray?

Step-by-step solution

Barium tests are used to examine the digestive tract using a white powder called barium sulphate. This powder can be seen on x-rays. For a barium swallow or barium meal, the barium sulphate powder is mixed with water (and sometimes flavouring) then swallowed. X-rays are taken as you swallow the mixture.