title: Radon exhalation from sub-slab aggregate used in home construction in Canada.
abstract: Exposure to elevated levels of radon in homes has been shown to result in an increased risk of developing lung cancer. The two largest contributors to indoor radon are radon in soil gas, formed from the rocks and soil surrounding the home, and building materials such as aggregate. This study measured the surface radon exhalation rates for 35 aggregate samples collected from producers across Canada. The radon exhalation rates ranged from 2.3 to 479.9 Bq m(-2) d(-1), with a mean of 80.7±112 Bq m(-2) d(-1). Using a simple, conservative analysis, the aggregate contribution to radon concentrations in an unfinished basement was determined. The maximum estimated radon concentration was 32.5±2.7 Bq m(-3), or ~16 % of the Canadian Radon Guideline. It can be concluded that under normal conditions radon exhalation from aggregate contributes very little to the total radon concentration in indoor air.
authors.affiliation: Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON K1A 0K9, Canada lauren.bergman@hc-sc.gc.ca.
authors.forename: Lauren
authors.initials: L
authors.lastname: Bergman
authors.affiliation: Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON K1A 0K9, Canada.
authors.forename: Jaeyoung
authors.initials: J
authors.lastname: Lee
authors.affiliation: Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON K1A 0K9, Canada.
authors.forename: Baki
authors.initials: B
authors.lastname: Sadi
authors.affiliation: Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, ON K1A 0K9, Canada.
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D001417:Background Radiation; D002170:Canada; D003252:Construction Materials; D004058:Diffusion; D006798:Housing; D000069079:Radiation Exposure; D011886:Radon / Q000032:analysis*
chemical_list: D000396:Air Pollutants, Radioactive; D011886:Radon