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Natural gamma radiation borehole logging system

Patent ·
OSTI ID:7362863
; ;
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.
Assignee:
Mobil Oil Corp.
Patent Number(s):
US 3940610
OSTI ID:
7362863
Country of Publication:
United States
Language:
English

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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
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47 OTHER INSTRUMENTATION
ACTINIDES
ALKALI METALS
AMPLIFIERS
CHEMICAL ANALYSIS
COUNTING RATEMETERS
DISCRIMINATORS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
EXPLORATION
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GAMMA SPECTROMETERS
MEASURING INSTRUMENTS
METALS
OPERATIONAL AMPLIFIERS
POTASSIUM
PULSE CIRCUITS
PULSE DISCRIMINATORS
QUANTITATIVE CHEMICAL ANALYSIS
RADIOACTIVITY LOGGING
RADIOMETRIC ANALYSIS
SPECTROMETERS
THORIUM
URANIUM
WELL LOGGING