Radon-222 monitoring of soil diffusivity

Lehmann, Bernhard E.; Lehmann, Martin; Neftel, Albrecht; Tarakanov, Sergei V. (2000). Radon-222 monitoring of soil diffusivity. Geophysical Research Letters, 27(23), pp. 3917-3920. American Geophysical Union 10.1029/1999GL008469

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The temporal evolution of activity profiles of the radon isotope 222Rn in the top 50 cm of soil is used to quantify diffusive gas transport in the air-filled pore space. Air is continuously collected from gas-permeable, hydrophobic membrane tubes placed at various depths under the surface and circulated through a high-sensitivity Rn detector. With a micro-processor controlled inlet system an automatic monitoring of several levels is possible for extended periods of time with a typical time resolution of one hour. In addition, a new dynamic approach to measure the in-situ soil diffusivity Ds (m²/s) around the subsurface tubes is presented where the recovery from air injection is evaluated every 3 hours. Within a test period of 3 weeks Ds dropped from 10−6 m²/s to 3 10−7 m²/s at a depth of z=50 cm due to increasing water content of the soil.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Lehmann, Bernhard

Subjects:

500 Science > 530 Physics

ISSN:

0094-8276

Publisher:

American Geophysical Union

Language:

English

Submitter:

BORIS Import 2

Date Deposited:

06 Sep 2021 18:40

Last Modified:

06 Sep 2021 18:40

Publisher DOI:

10.1029/1999GL008469

BORIS DOI:

10.48350/158796

URI:

https://boris.unibe.ch/id/eprint/158796

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