Which adioactive pollutant has recently drawn the attention of the public due to its occurrence in the building materials? (1) Radium (2) Radon (3) Thorium (4) Rlutonium

Which adioactive pollutant has recently drawn the attention of the public due to its occurrence in the building materials? (1) Radium (2) Radon (3) Thorium (4) Rlutonium
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(3) Thorium Explanation: Thorium, a naturally occurring radioactive element, four times more abundant than uranium in the earth's crust.
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In a nuclear reactor the material use for absorbing neutrons is (1) zinc (2) radium (3) lead (4) cadmium

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Hey guys, could you share your opinions about working in a building company What should I pay attention to Common pitfalls Thanks in advance!?

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