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Published on: May 7, 2013
Radon exhalation rate from various building materials
1Institute of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, R.O.C.
This study introduces a new method using cellulose nitrate detectors to measure radon exhalation rates from building materials. This technique helps estimate potential indoor radon concentrations, crucial for building material safety.
Area of Science:
- Environmental Science
- Radiation Physics
- Building Science
Background:
- Radon is a radioactive gas that poses health risks, particularly indoors.
- Building materials can be a significant source of indoor radon.
- Accurate measurement of radon exhalation rates is essential for risk assessment.
Purpose of the Study:
- To develop and validate a method for measuring radon exhalation rates from building materials.
- To establish a database of radon exhalation rates for various building materials.
- To provide a simplified model for estimating maximum indoor radon concentrations.
Main Methods:
- Utilized solid-state alpha-track detectors made of cellulose nitrate films.
- Employed an inverted cup technique to capture radon flux from material surfaces.
- Analyzed alpha particle tracks on films using spark counters or microscopes after etching in NaOH solution.
Main Results:
- Successfully measured radon exhalation rates from building materials.
- Developed a mathematical approach to estimate radon flux and concentration.
- Excluded infiltration and ventilation effects for focused material assessment.
Conclusions:
- The developed technique offers a reliable method for assessing radon exhalation from building materials.
- The simplified model allows for the estimation of maximum indoor radon levels based on material exhalation rates.
- This approach can contribute to building material safety standards and indoor air quality management.
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