Radiant energy – Geological testing or irradiation
Patent
1974-02-15
1976-02-24
Dixon, Harold A.
Radiant energy
Geological testing or irradiation
250262, 250369, G01V 500, G01T 120
Patent
active
039406105
ABSTRACT:
A borehole logging system employs a gamma-ray detector for measuring the natural gamma radiation of the earth formations surrounding a borehole. Three energy band selectors, each employing a discriminator and count rate meter, separate the output of the gamma-ray detector into potassium, uranium, and thorium energy band signals. A first operational amplifier determines the difference between the potassium energy band signal and those portions of the uranium and thorium energy band signals which represent the influence of uranium and thorium gamma radiation within the potassium energy band, this difference representing the correct potassium gamma radiation. A second operational amplifier determines the difference between the uranium energy band signal and that portion of the thorium energy band signal which represents the influence of the thorium gamma radiation within the uranium energy band, this difference representing the correct uranium gamma radiation. A third operational amplifier determines the difference between the thorium energy band signal and that portion of the uranium energy band signal which represents the influence of the uranium gamma radiation within the thorium energy band, this difference representing the correct thorium gamma radiation.
REFERENCES:
patent: 2529666 (1950-11-01), Sands
patent: 2562968 (1951-08-01), Teichmann et al.
patent: 2897368 (1959-07-01), Lundberg et al.
patent: 3105149 (1963-09-01), Guitton et al.
Dennis Charles L.
Givens Wyatt W.
Hickman John B.
Dixon Harold A.
Hager Jr. George W.
Huggett C. A.
Mobil Oil Corporation
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