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A comparative study on different methods of measuring Rn concentrations in homes.
C Svensson1, G Pershagen, Z Hrubec
1Department of Epidemiology, National Institute of Environmental Medicine, Stockholm, Sweden.
Health Physics
|December 1, 1988
Summary
Comparing radon measurement methods in homes, thermoluminescence dosimeters (TLDs) and alpha track dosimeters (ATDs) showed high correlation. However, ATDs measured higher radon concentrations than TLDs, suggesting potential differences in exposure assessment accuracy.
Area of Science:
- Environmental Science
- Radiological Health
- Indoor Air Quality
Background:
- Radon-222 (Rn) is a naturally occurring radioactive gas and a significant indoor air pollutant.
- Accurate measurement of indoor radon concentration is crucial for epidemiological studies and risk assessment.
Purpose of the Study:
- To compare the performance of three different methods for measuring indoor radon-222 concentration.
- To evaluate the correlation and agreement between thermoluminescence dosimeters (TLDs) and alpha track dosimeters (ATDs) over different measurement periods.
Main Methods:
- Measurements were conducted in 91 homes using TLDs for two weeks (winter) and ATDs for six months (heating season) and one year.
- Statistical analysis, including correlation coefficients (r), was used to compare the results from the different measurement devices.
Main Results:
- High correlations were observed between TLD and six-month ATD (r = .83), and between six-month and one-year ATD (r = .80) values.
- Six-month ATD measurements were, on average, approximately 50 Bq m-3 higher than TLD measurements (p < .0001).
- Six-month ATD values were approximately 8% higher than one-year ATD values, likely due to reduced ventilation in colder months.
Conclusions:
- The studied measurement methods (TLDs and ATDs) are potentially valuable for radon exposure assessments in epidemiological research.
- Differences in measured radon concentrations between methods and time periods necessitate cautious interpretation of risk estimates per unit radiation exposure.