Journal ArticleDOI
Atmospheric pressure effects on 222Rn transport across the Earth-air interface
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TLDR
The effect of large-scale atmospheric pressure changes on the 222Rn flux across the soil-air interface is investigated in this paper, where a simple model of molecular diffusion combined with pressure-induced transport in the soil has been confirmed by laboratory experiments using a vertical column of 226Ra-bearing sand.Abstract:
The effect of large-scale atmospheric pressure changes on the 222Rn flux across the soil-air interface is investigated. Field data collected during 1972 and 1973 show that pressure changes of 1–2% associated with the passage of frontal systems produce changes in the 222Rn flux from 20 to 60%, depending upon the rate of change of pressure and its duration. A simple model of molecular diffusion combined with pressure-induced transport in the soil has been confirmed by laboratory experiments using a vertical column of 226Ra-bearing sand. On the basis of this model, pressure changes of 10–20 mbar occurring over a period of 1–2 days produce Darcy velocities of the order of 10−4 cm s−1 near the surface of a soil having a permeability of 10−8 cm2. The corresponding variations in the 222Rn flux predicted by the model are in agreement with those observed from valley alluvium in central New Mexico.read more
Citations
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Soil CO2 flux measurements in volcanic and geothermal areas
TL;DR: The accumulation chamber methodology allows one to obtain reliable values of the soil CO2 flux in the range 0.2 to over 10 000 g m−2 d−1, as proven by both laboratory tests and field surveys in geothermal and volcanic areas as discussed by the authors.
Journal ArticleDOI
Geochemistry of Atmospheric Radon and Radon Products
TL;DR: In this paper, a total global model is proposed for radon-222 and its daughters, and the mean residence time of aerosols is analyzed in terms of radon flux and lead-210 atmospheric flux.
Journal ArticleDOI
Radon transport from soil to air
TL;DR: In this article, the authors reviewed the factors that control the rate at which two radon isotopes, 222Rn and 220Rn, enter outdoor and indoor air from soil.
Journal ArticleDOI
Gas geochemistry and seismotectonics: a review
TL;DR: In this article, the main sources, behaviours and uses of species detected in soils and springs are displayed, and their mode of sampling and analysing briefly described, and the main patterns of degassing in soils are described and a wide range of geochemical signatures as the result of both permeability and mineralogical contrasts.
Journal ArticleDOI
Migration of carrier and trace gases in the geosphere: an overview
TL;DR: The role of gas diffusion and water advection in the transport of endogenous gas to the Earth surface should be strongly minimized in many contexts as mentioned in this paper, in contrast with early views.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Book
Methods for the Numerical Solution of Partial Differential Equations
Von Rosenberg,U Dale +1 more
Journal ArticleDOI
Improved Low‐Level Alpha‐Scintillation Counter for Radon
TL;DR: In this article, a low counter background is obtained by use of steel for the shell and quartz for the counter window, while marked improvement in the stability is achieved by coating the window with an electrically conducting layer of tin oxide.