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Radiation Protection Dosimetry 45:85-89 (1992)
© 1992 Oxford University Press

A Small-Diameter Probe for In Situ Measurements of Gas Permeability of Soils

A. Damkjaer and U. Korsbech

A permeability probe for in situ measurements has been designed and tested. The probe head is 16 mm in diameter and 150 mm long. The probe is led to the measurement position through a 20 mm diameter borehole cased with a plastic tube. The permeability probe operates in the injection mode, i.e. air is pumped into the formation under constant pressure. This paper summarises the theoretical framework for the permeability measurement and gives the shape factor for the probe. The instrumentation is described and a laboratory calibration facility is designed and tested. The measured shape factor for the probe in the calibration facility was found to agree well with the calculated value. A site mapping of the permeability to a depth of 2 m has been performed. The results are summarised and compared with a geological description of the strata. A possible correlation between the measured permeability and the applied pressure difference has been investigated.


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