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Bronchial Rn dose survey for residences
1Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong. peter.yu@cityu.edu.hk
Journal of Environmental Radioactivity
|May 31, 2001
Summary
This study measured radon (Rn) progeny doses in Hong Kong homes using a bronchial dosimeter. Results show average doses and highlight humidity
Area of Science:
- Environmental Health
- Radiation Dosimetry
- Public Health
Background:
- Radon (Rn) progeny pose a significant indoor inhalation risk.
- Accurate dosimetry is crucial for assessing health impacts.
- Previous methods required validation in diverse residential settings.
Purpose of the Study:
- To assess bronchial doses from radon progeny in Hong Kong residences.
- To determine dose conversion factors (DCF) for radon exposure.
- To investigate environmental factors influencing radon levels and doses.
Main Methods:
- Utilized the Yu and Guan bronchial dosimeter (1998) for radon progeny surveys.
- Conducted measurements in 30 Hong Kong residences.
- Analyzed potential alpha energy concentration (PAEC) and radon gas concentration (RC).
Main Results:
- Obtained an average bronchial deposition fraction of 0.0334.
- Calculated an average dose conversion factor (DCF) of 8.5 mSv WLM-1.
- Mean annual effective dose (E) was 1.2 +/- 0.5 mSv yr-1; mean radon concentration (RC) was 23 +/- 10 Bq m-3.
- Indoor relative humidity significantly impacted PAEC and RC (>95% confidence).
Conclusions:
- The bronchial dosimeter effectively surveyed radon progeny doses in homes.
- Significant differences in annual dose conversion factors (ADCF) were observed between air-conditioned and non-air-conditioned sites.
- Indoor humidity is a key factor influencing radon progeny exposure levels.