Mention about the uses of barium.

Explanation

In metallurgy, its compounds are used in pyrotechnics, petroleum mining and radiology.
(ii) Deoxidizer in copper refining.
Its alloys with nickel which readily emits electrons hence used in electron tubes and spark plug electrodes.
(iv) As a scavenger to remove last traces of oxygen and other gases in television and on electronic tubes.
(v) An isotope of `"barium"^(133)`Ba, used as a se isotope of barium "Ba, used as a source in the calibration of gamma ray detector nuclear chemistry.