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________________ is used as a final coat for surfaces of X-Ray rooms.

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________________ is used as a final coat for surfaces of X-Ray rooms.

(a) Gypsum plaster

(b) Barium plaster

(c) Granite plaster

(d) Marble plaster

I got this question in exam.

I would like to ask this question from Special Materials for Plastered Surfaces in section Pointing and Plastering of Construction & Building Materials

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The correct choice is (b) Barium plaster

Explanation: Barium plaster is used as a final coat for surfaces of X-Ray room so as to protect the person working in and around X-Ray rooms. It is essentially made from Barium sulphate.

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