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Effects of Access Tube Material and Grout on Neutron Probe Measurements in the Vadose Zone
Author(s) -
Keller B. R.,
Everett L. G.,
Marks R. J.
Publication year - 1990
Publication title -
groundwater monitoring and remediation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 47
eISSN - 1745-6592
pISSN - 1069-3629
DOI - 10.1111/j.1745-6592.1990.tb00326.x
Subject(s) - grout , vadose zone , borehole , geotechnical engineering , geology , water content , tube (container) , moisture , materials science , composite material , groundwater
A test‐stand experiment was conducted on neutron probe measurements using steel and Schedule 40 PVC access tubes to determine the effect of backfill grout in boreholes. The experiment used a moveable simulated vadose zone. Access tubes and grout do have masking effects on vadose zone measurements, but vadose zone moisture was detected through all configurations tested. Steel tubing has a smaller masking effect than PVC tubing. The masking effect of grout increased with borehole diameter. Although this experiment produced numerical results, conclusions drawn are qualitative in nature, rather than a quantitative calibration of the technique.