Radon is produced by the decay of uranium, which is naturally present in rock and soil. Radon gas is released into the air when uranium ore is mined and, to a lesser extent, during the production of uranium fuel for nuclear power plants.

The CNSC regulates radon in Canada's nuclear facilities to protect workers, members of the public and the environment.

Quick Facts:

  • Long-term exposure to elevated levels of radon increases the risk of developing lung cancer, which is why the CNSC ensures that the air quality in a uranium mine is strictly controlled with good ventilation.
  • Current uranium mines require engineering design and control processes to evacuate radon in order to limit exposures to safe levels.
  • As a result, the lung cancer risk for today's uranium mining and processing workers is the same as that for the general Canadian public.
  • Presently, worker exposures to radon in the uranium mining and processing industry are as low as, or only slightly greater than, public exposure from natural radon.
  • The level of radon in the environment near uranium mines is similar to radon levels monitored in background locations.
  • Radon exposure to members of the public from CNSC-regulated activities is virtually zero.

Read the Radon Fact Sheet

Read the Radon and Health Information Document (PDF)

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