Calibration models for measuring moisture in unsaturated formations by neutron logging

Vadose Zone Transport Field Study: Detailed Test Plan for Simulated Leak Tests

“…steel casings. This can be done without need for centering devices, provided the probe is adequately calibrated (Tyler 1988;Engleman et al 1995b;Fayer et al 1995). For FY 2000, one of the neutron probes used by Fayer et al (1995) is available.…”

Monitoring Plan for Fiscal Year 1999 Borehole Logging at 200 East Area Specific Retention Facilities

“…Measurements for the moisture tool calibration are acquired in the moisture calibration tanks located at Neil F. Lampson Inc., Pasco, Washington. The construction of these models is documented in Engleman (1995). The models contain moisture contents (percent by volume) of 5°/0, 12%, and 29% and are constructed with casing configurations for both 15.24-cm (6-in.)…”

1999 vadose zone monitoring plan and guidance for subsequent years

“…The neutron logging system was extremely sensitive and easily detected a hction of a percent change in moisture content. Use of the neutron probe was discontinued when more stringent radiation protection measures were implemented that made it difficult to shield operating personnel from the Pu-Be source radiation (Raymond and McGhan 1992 (Engelman et al 1995) and the models currently are available for use.…”