Abstract
In this work, the radon exhalation, annual effective dose and excess lifetime cancer risks due to the exposure of radon released from raw building materials containing fly ash of different fractions were evaluated. The 226Ra and 222Rn concentrations were evaluated by the measurements on HPGe gamma spectrometer, RAD 7 radon detector combined with model calculation of radon exhalation for standard rooms. The results indicated that the emanation fraction for fly ash is lower than the corresponding value for soils and rocks. The surveyed building materials of containing fly ash can result in an indoor radon concentration up to 1.7 Bq m−3 which is below the recommended value of 100 Bq m−3 by WHO, the annual effective dose increases from 0.007 to 0.022 mSv year−1, the excess lifetime cancer risks ranges from 0.027 × 10–3 to 0.085 × 10–3 with the ratio of 3.2 for the additional fly ash content in cement up to 75%. In the meanwhile, it has a down trend and influences inconsiderably on these parameters for sand. The obtained mean annual effective doses are lower than the dose limitation of 10 mSv year−1 recommended for occupational workers.
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Acknowledgments
This research is granted by National Foundation for Science and Technology Development (Nafosted) under the Number 103.04-2018.61. Our Nuclear Technique Laboratory (NTLab) was invested by Vietnam National University Ho Chi Minh City, Viet Nam. We would like to express our sincere thanks to Prof. Dr. Sc. Nguyen Ngoc Tran, Dr. Le Xuan Thuyen and the Board of Directors of the EVN Group, the Board of Directors of Vinh Tan 2 CFPP for sampling in the inner area and the disposal area of the CFPP.
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Vu, B.N., Bui, T.N., Huynh, P.T.N. et al. Semi-experimental evaluation for radon exhalation rate and excess lifetime cancer risk from potential radon exposure for using fly ash building materials. J Radioanal Nucl Chem 326, 975–981 (2020). https://doi.org/10.1007/s10967-020-07377-1
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DOI: https://doi.org/10.1007/s10967-020-07377-1