Radon is a natural radioactive gas that emanates from the ground into the air.

氡是一种放射性的自然气体，从地下散发到空气中。

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Radon is a chemically inert, naturally occurring radioactive gas without odour, colour or taste.

氡是一种自然产生的放射性惰性气体，它无色、无味、无臭。

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Radon is a chemically inert, naturally occurring radioactive gas. It has no smell, colour or taste.

氡是一种天然产生的放射性惰性气体，它无色、无味、无臭。

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They did not understand what had happened immediately because the radioactive gas had no odour or colour.

BBC: Eyewitness: Tragedy of Soviet nuclear submarine K-27

The power plant has been shut down since this winter, when a small amount of radioactive gas escaped from a steam generator during a water leak.

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No new plants have been ordered there since the accident at Three Mile Island in Pennsylvania in 1979 (when radioactive gas escaped from a nuclear power plant), though some that were being built were completed.

ECONOMIST: Boom