What are the levels of radon exposure in Port Hope?
A23. Radon represents the most important source of naturally occurring radiation exposure for humans. Radon exposure in Port Hope is about 0.6 mSv/year, which represents 23% of the region’s total average annual radiation dose. This is comparatively lower than rates in other regions of Canada and around the world: • For all of Canada, radon exposure is about 0.92 mSv/year, which represents 32% of the total average annual radiation dose. • Worldwide, radon exposure is about 1.2 mSv/year, representing 43% of the total average annual radiation dose Historic low-level radioactive wastes near residential and commercial buildings are an additional source of radon and its decay products in Port Hope. Before remediation, some homes in Port Hope had radon concentrations as high as 350 Bq/m3. Following remediation, typical median indoor air concentrations of radon were about 25 Bq/m3 in living areas and about 40 Bq/m3 in basements of Port Hope homes. The upper radon concentrations detected were a
