A comparison of winter short-term and annual average radon measurements in basements of a radon-prone region and evaluation of further radon testing indicators.
Barros NG; Steck DJ; Field RW
Health Phys 2014 May; 106(5):535-544
The primary objective of this study was to investigate the temporal variability between basement winter short-term (7 to 10 d) and basement annual radon measurements. Other objectives were to test the short-term measurement's diagnostic performance at two reference levels and to evaluate its ability to predict annual average basement radon concentrations. Electret ion chamber (short-term) and alpha track (annual) radon measurements were obtained by trained personnel in Iowa residences. Overall, the geometric mean of the short-term radon concentrations (199 Bq m) was slightly greater than the geometric mean of the annual radon concentrations (181 Bq m). Short-term tests correctly predicted annual radon concentrations to be above the 148 Bq m action level 88% of the time and above a 74 Bq m level 98% of the time. The short-term and annual radon concentrations were strongly correlated (r = 0.87, p < 0.0001). The foundation wall material of the basement was the only significant factor to have an impact on the absolute difference between the short-term and annual measurements. The findings from this study provide evidence of a substantially lower likelihood of obtaining a false negative result from a single short-term test in a region with high indoor radon potential when the reference level is lowered to 74 Bq m.
Air-monitoring; Air-quality; Air-quality-measurement; Air-quality-monitoring; Monitors; Monitoring-systems; Quality-control; Exposure-levels; Sampling; Short-term-exposure; Radiation; Ionizing-radiation; Ionization-chambers; Radioactive-measurement; Radiological-equipment; Gamma-radiation;
Author Keywords: detector; alpha-track; electrets; radon; sampling
R. William Field, Department of Occupational and Environmental Health, College of Public Health, S327 CPHB, 105 River Street, University of Iowa, Iowa City, IA 52242
University of Iowa