Accession Number : AD0721095

Title :   Design and Calibration of a Deep Ocean Nuclear Probe for Sediment Water Content.

Descriptive Note : Final rept. 1 Nov 68-10 May 70,

Corporate Author : OREGON STATE UNIV CORVALLIS RADIATION CENTER

Personal Author(s) : Ringle,John C. ; Bell,J. Richard ; Hurley,James L.

Report Date : 10 MAY 1970

Pagination or Media Count : 73

Abstract : A laboratory model of a nuclear moisture meter was constructed and calibrated. The meter which is composed of an AmBe neutron source and a Cd-covered LiI detector, measures epithermal neutrons. Samples of varying composition and moisture content were assembled and used to determine the accuracy of the meter. The atom-percent-water in any sample was found to vary linearly with epithermal count rate, a result expected and predicted theoretically. These measurements were sediment-independent. The moisture content was determined from the atom-percent-water by using porosity. The moisture content was sediment-dependent, as expected. The moisture content can be determined over a range of about 20 to 350%. If no information is known about the sediment, the maximum error in moisture content is about 32%; the average error is about 16%. If information is available concerning the sediment (as from a core sample or a gamma density probe), the maximum error in moisture content is about 23%; the average error is about 9%. (Author)

Descriptors :   (*OCEANOGRAPHIC EQUIPMENT, *NEUTRON DETECTORS), (*THERMAL NEUTRONS, MEASUREMENT), (*OCEAN BOTTOM, MOISTURE), SEDIMENTATION, POROSITY, DEEP WATER, LITHIUM COMPOUNDS, IODIDES, CALIBRATION, THERMAL PROPERTIES, NEUTRON COUNTERS, CADMIUM

Subject Categories : Physical and Dynamic Oceanography
      Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE