ABSTRACT
The neutron moisture probe is increasingly being applied to vadose zone hydrogeologic problems such as site characterization, contaminant leak detection and monitoring, remediation, infiltration, and recharge. Ground-water scientists and engineers should be acquainted with the principles of operation, limitations, and advantages of neutron measurements. This chapter reviews the theory and application of neutron moisture probes and presents results from its use. The first part provides background necessary to understand the technique. The second part describes three monitoring projects which successfully employed the method. The intent of the authors is to provide a useful guide to the advantages of this monitoring approach.
