This work presents a technique for determining the radon (222Rn) diffusion length in porous materials. A mathematical model that describes the process of radon diffusion in a closed chamber, divided into two sections by a porous building material, is proposed. The derived relations allow evaluating the radon diffusion length in the material from measurements of the radon concentrations in the two sections. Preliminary experimental results are presented for the diffusion lengths of concrete and gypsum obtained by measuring the radon concentration via two standard passive detection methods: electrostatic electret chambers and activated charcoal canisters. The electret measurements were checked by a solid state continuous radon monitor.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1097/00004032-200405000-00007 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Characteristics of radon transport and optimization of ventilation parameters in large-scale underground cavern.
J Environ Radioact
January 2025
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China.
Radon penetrates into the underground caverns through the pores/fissures of the surrounding rock, resulting in high radon concentration area and endangering the health of construction personnel. The on-site monitoring of radon concentration in the underground powerhouse of Tuoba Hydropower Station is conducted in order to study the radon concentration level. The radon transport during the construction period of underground powerhouse under forced ventilation is established by Computational Fluid Dynamics (CFD) numerical simulation method.
View Article and Find Full Text PDFDetermination of representative elementary surface for accurately measuring radon exhalation rate in masonry wall.
J Hazard Mater
November 2024
School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China.
Article Synopsis
- * Different materials, such as bricks and cement mortar, have varying radon exhalation rates, necessitating careful consideration of measurement methods and apparatus used.
- * A Computed Fluid Dynamics (CFD) study found that selecting a representative elementary surface (RES) for measurement can lead to more accurate results in assessing radon exhalation from masonry walls.
Natural radon levels act as markers of hydrodynamic behavior in the mountain karst aquifer of Bossea Cave, Italy.
Sci Rep
November 2024
Department of Environment, Land and Infrastructure Engineering (DIATI), Politecnico di Torino, Turin, Italy.
Article Synopsis
- - Radon is transported within the Bossea karstic mountain aquifer through both advective and diffusive processes, with fluctuations correlating to hydrodynamics rather than external weather factors.
- - Delayed concentration peaks of radon in underground water occur after flooding, with a 45-hour delay in the upper canyon and 66 hours in collapse chambers due to varying water flow dynamics.
- - Different radon levels are detected in the main creek compared to secondary inflows; the main creek experiences increases during flooding, while secondary inflows see dilution from new infiltrating water, with no significant relationship found between radon emissions and seismic activity.
Assessment of indoor radon levels at multiple floors of an apartment building in the historic center of Rome (Italy): a comprehensive study.
Environ Sci Pollut Res Int
November 2024
Istituto Nazionale Di Geofisica E Vulcanologia, Via Di Vigna Murata 605, 00143, Rome, Italy.
The urbanized area of Rome is largely built over volcanic deposits, characterized by a significant radionuclides content and consequently a high radon emanation potential. An accurate monitoring of workplaces and residential dwellings constitutes a first step towards mitigating the indoor radon exposure. Since radon diffusion dynamics involves complex interactions among many environmental parameters on different time scales, a proper assessment of radon concentration variations can be better achieved by means of active monitoring approaches.
View Article and Find Full Text PDFSeasonal Indoor Radon Assessment and Estimation of Cancer Risk: A Case Study of Obafemi Awolowo University Nigeria.
Environ Health Insights
August 2024
Deparment of Otorhinolaryngology, College of Health Sciences, Ladoke Akintola University of Technology, Ogbomoso, Nigeria.
Human exposure to indoor radon has been a subject of continuous concern due to its health implications, especially as it relates to lung cancer. Radon contaminates indoor air quality and poses a significant health threat if not abated/controlled. A seasonal indoor radon assessment of residential buildings of Obafemi Awolowo University was carried out to determine radon seasonal variability and to evaluate the cancer risk to the residents.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!