Theoretical model for calculating and adjusting radon activity concentration in ventilation networks of uranium mines considering pressure drop effect

The radiation dose of workers in underground uranium mines mainly comes from radon and radon progeny. To ensure a healthy and safe work environment, it is necessary and urgent to optimize the design of ventilation systems. As such, based on the simplified radon diffusion-advection migration model of...

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Veröffentlicht in:Journal of environmental radioactivity Jg. 276; S. 107440
Hauptverfasser: Ye, Yongjun, Shang, Shanwei, Zhang, Yingpeng
Format: Journal Article
Sprache:Englisch
Veröffentlicht: England Elsevier Ltd 01.06.2024
Schlagworte:
Adjustment method
Air Pollutants, Radioactive - analysis
Air Pollution, Indoor - analysis
Air Pollution, Indoor - statistics & numerical data
algorithms
Mining
Models, Theoretical
Occupational Exposure - analysis
progeny
Radiation Monitoring - methods
radioactivity
radon
Radon - analysis
Radon activity concentration
Radon exhalation rate
theoretical models
uranium
Uranium - analysis
Ventilation
Ventilation method
Ventilation network
working conditions
Adjustment method
Ventilation network
Radon activity concentration
Ventilation method
Radon exhalation rate
ISSN:0265-931X, 1879-1700, 1879-1700
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Zusammenfassung:The radiation dose of workers in underground uranium mines mainly comes from radon and radon progeny. To ensure a healthy and safe work environment, it is necessary and urgent to optimize the design of ventilation systems. As such, based on the simplified radon diffusion-advection migration model of the rocks, this paper proposes 1) two methods for determining the radon exhalation rate modified by pressure drop, 2) three methods for calculating radon activity concentration of single-branch, and 3) the novel adjustment algorithm and solving procedures for calculating and adjusting the radon activity concentration in ventilation networks by modifying the radon exhalation rate, demonstrated on a specific ventilation network in a simulated underground uranium mine with calculation and analysis via MATLAB. The results show that 1) the radon exhalation rate of different branches can be modified by their pressure drop, and 2) the proposed method can be used to reveal the influences of different ventilation methods and fan pressures on the radon activity concentration in the ventilation network and the radon release rate to the atmosphere. •Two methods to modify the radon exhalation rate of roadway-surrounding rocks by pressure drop were developed.•Three methods were proposed for reasonably calculating the radon activity concentration in single branch.•The novel adjustment algorithm and solving procedures for analyzing radon-containing ventilation networks were established.•The ventilation methods and its operating parameters of radon reduction were evaluated and optimized.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0265-931X
1879-1700
1879-1700
DOI:10.1016/j.jenvrad.2024.107440