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Improved data analysis techniques for calculating more accurate radon and thoron exhalation rates from building
Akihiro Sakoda1, Yuu Ishimori2, Qianhao Jin3
1Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency, 1550 Kamisaibara, Kagamino-cho, Tomata-gun, Okayama, 708-0698, Japan.
Mathematical models significantly impact radon and thoron exhalation rate analysis. Thoron heterogeneity and diurnal radon variations require careful consideration for accurate indoor radiation measurements.
Area of Science:
- Environmental Science
- Nuclear Physics
- Building Science
Background:
- Radon (222Rn) and thoron (220Rn) are naturally occurring radioactive gases.
- Indoor radon and thoron levels are influenced by building materials and ventilation.
- Accurate measurement of exhalation rates is crucial for radiation protection.
Purpose of the Study:
- To investigate the influence of mathematical models and parameters on radon and thoron exhalation rates.
- To enhance data analysis techniques for in-situ measurements.
- To assess the significance of heterogeneity and diurnal variations in indoor radioactive gas concentrations.
Main Methods:
- In-situ testing of building interior solid walls.
- Application of various mathematical models for data analysis.
- Comparative analysis of radon (222Rn) and thoron (220Rn) activity concentrations.
Main Results:
- Mathematical models and parameters significantly impact the determination of exhalation rates.
- Activity concentration heterogeneity was more pronounced for thoron (220Rn) than for radon (222Rn).
- Diurnal variations in indoor radon (222Rn) levels were observed and deemed important for data quality.
Conclusions:
- The selection and development of mathematical models should align with the specific objectives and required accuracy of radon/thoron exhalation tests.
- Accounting for gas heterogeneity and temporal variations is essential for reliable indoor radiation assessments.
- Improved data analysis techniques are necessary for accurate characterization of radioactive gas emissions from building materials.
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