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Determining 222Rn diffusion lengths in soils and sediments.

J Søgaard-Hansen¹, A Damkjaer

¹Risø National Laboratory, Roskilde, Denmark.

|November 1, 1987

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Radon-222 diffusion length was measured in Danish soils. Diffusion lengths varied significantly, from 1 cm in wet clay to 190 cm in dry sand and gravel.

Area of Science:

Environmental Science
Geology
Nuclear Physics

Background:

Radon-222 (222Rn) is a naturally occurring radioactive gas.
Understanding radon transport in soils is crucial for environmental and health assessments.
Soil properties significantly influence radon gas diffusion.

Purpose of the Study:

To measure the diffusion length of Radon-222 in various Danish soil and sediment types.
To investigate the impact of soil moisture and composition on radon transport.
To provide data for environmental modeling and radon risk assessment.

Main Methods:

Collected 28 soil and sediment samples from Denmark.
Utilized a diffusion column connected to a 222Rn reservoir to measure gas transport.

Related Experiment Videos

Applied time-dependent diffusion theory to analyze measured data and determine diffusion lengths.

Main Results:

Diffusion lengths ranged from approximately 1 cm in wet clay materials.
Dry silt, sand, and gravel exhibited diffusion lengths between 160 cm and 190 cm.
Significant variation in 222Rn diffusion was observed based on soil moisture and texture.

Conclusions:

Soil moisture content is a critical factor affecting Radon-222 diffusion.
Danish soil types demonstrate a wide spectrum of radon gas mobility.
These findings contribute to more accurate environmental radon modeling and risk assessment.