Which radioactive pollutant has recently drawn the attention of the public, due

Which radioactive pollutant has recently drawn the attention
of the public, due to its occurrence in the building material?

1 Radium

2 Radon

3 Thorium

4 Plutonium

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Which radioactive pollutant has recently drawn the attention of the public, due to its occurrence i..

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(3) Thorium

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