Abstract
AbstractResearch at the Idaho National Engineering Laboratory investigated the movement of water through a thick fractured basalt vadose zone. Measurements taken in 20‐cm diameter boreholes completed with 10.2‐cm diameter PVC casing and in specially constructed test containers filled with basalt showed that 50‐m Ci neutron moisture gauges could distinguish differences in moisture levels in the basalt formation beyond the well's annular space. Measurements made at depths up to 55 m in similarly constructed monitoring wells in the field showed that moisture gauge readings lead to the same interpretation of moisture movement as readings made with a 3‐Ci neutron tool.
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