Method of determining the density of substrata

Details Method of determining the density of substrata Method of determining the density of substrata

1988-06-06

1989-04-11

Howell, Janice A.

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250256, 2503581, 378 89, G01N 924, G01N 2302, G01V 512

Patent

active

048209198

ABSTRACT:
A method for determining the density of substrata by means of a radiation source K comprising a collimator (1) and of a detector comprising a collimator (3), by which method the direction of radiation may optionally be changed in relation to the direction of detection, and the change of the detected signal may be measured. According to the invention the direction of radiation and the direction of detection are situated in substantially the same plane. By deducting the signal of the desirable depth of measurement from a somewhat greater depth of measurement, substantially only the signal originating from singly scattered radiation is obtained, and as a result it will be possible to measure the density at greater depth than previously. On the basis of a spectrum analysis of the spectrum originating from the measurement, the variation of the density with the depth could be obtained.

REFERENCES:
patent: 3176134 (1965-03-01), Wright
patent: 3531643 (1970-09-01), Bretonniere et al.
patent: 4034218 (1977-07-01), Turcotte
patent: 4048495 (1977-09-01), Ellis
patent: 4529877 (1985-07-01), Arnold
Jorgensen et al., "Density Measurements by Means of Once Scattered Gamma Radiation, The ETG Probe, Principles, and Equipment" from Dept. of Electrophysics, Technical University of Denmark, National Road Laboratory 1987.

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