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Class Information
Number: 250/262
Name: Radiant energy > Geological testing or irradiation > Well testing apparatus and methods > With particular detector signal circuit
Description: Subject matter wherein the means to detect radiation emitted naturally or radiation modified or caused by material interacting with radiation includes a radiation detector and a detailed electrical circuit connected between the detector and an indicator or recorder of the radiation sensed by the detector and includes methods corresponding to the apparatus.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7342222 |
Method and apparatus for downhole spectroscopy processing |
Mar. 11, 2008 |
| 7081616 |
Downhole gamma-ray detection |
Jul. 25, 2006 |
| 6997257 |
Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole |
Feb. 14, 2006 |
| 6766855 |
Apparatus and method for determining the dip of an underground formation in a cased or uncased borehole |
Jul. 27, 2004 |
| 6696684 |
Formation evaluation through azimuthal tool-path identification |
Feb. 24, 2004 |
| 6696362 |
Method for using an in situ particle sensor for monitoring particle performance in plasma deposition processes |
Feb. 24, 2004 |
| 6476384 |
Methods and apparatus for downhole fluids analysis |
Nov. 5, 2002 |
| 6369393 |
Digital pulse de-randomization for radiation spectroscopy |
Apr. 9, 2002 |
| 6307199 |
Compensation of errors in logging-while-drilling density measurements |
Oct. 23, 2001 |
| 6057542 |
System for determining composition of radionuclides |
May. 2, 2000 |
| 6037585 |
Determination of radioactive scale distribution using gamma ray logging technique |
Mar. 14, 2000 |
| 5777323 |
Method for logging an earth formation using recycled alpha data |
Jul. 7, 1998 |
| 5744804 |
System for determining a compositon of radionuclides |
Apr. 28, 1998 |
| 5744803 |
Radiation detector assembly and method with discrimination between vibration and radiation induced events |
Apr. 28, 1998 |
| 5672867 |
Method for filtering gamma ray well logging tool response to enhance vertical detail while suppressing statistical noise |
Sep. 30, 1997 |
| 5635711 |
Apparatus and method for the suppression of microphonic noise in proportional counters for borehole logging-while-drilling |
Jun. 3, 1997 |
| 5608214 |
Gamma ray spectral tool for well logging |
Mar. 4, 1997 |
| 5600135 |
Spectral gain stabilization using gross shape features of largely invariant spectra |
Feb. 4, 1997 |
| 5489779 |
Method for optimizing energy spectrum data from scintillation type radiation detectors |
Feb. 6, 1996 |
| 5486695 |
Standoff compensation for nuclear logging while drilling systems |
Jan. 23, 1996 |
| 5483061 |
Gamma ray scintillation detector apparatus and method for reducing shock induced noise |
Jan. 9, 1996 |
| 5461230 |
Method and apparatus for temperature compensation of gamma tools in MWD environments |
Oct. 24, 1995 |
| 5440118 |
Methods and apparatus for determining formation lithology by gamma ray spectroscopy |
Aug. 8, 1995 |
| 5397893 |
Method for analyzing formation data from a formation evaluation measurement-while-drilling logging tool |
Mar. 14, 1995 |
| 5360975 |
Method of gain regulation for downhole spectroscopy tools without using a calibration source |
Nov. 1, 1994 |
| 5349184 |
Method and apparatus for reducing matrix density effects on porosity measurements during epithermal neutron porosity well logging |
Sep. 20, 1994 |
| 5349195 |
Spectroscopy method for high count rate nuclear pulses |
Sep. 20, 1994 |
| 5345077 |
Method and apparatus for producing a porosity log of a subsurface formation corrected for detector standoff |
Sep. 6, 1994 |
| 5326970 |
Method and apparatus for logging media of a borehole |
Jul. 5, 1994 |
| 5321982 |
Method for measuring the rate of penetration of an equipment progressing in a well |
Jun. 21, 1994 |
| 5300770 |
Apparatus for producing a porosity log of a subsurface formation corrected for detector standoff |
Apr. 5, 1994 |
| 5272336 |
Temperature corrections of measurements made with scintillation detectors |
Dec. 21, 1993 |
| 5241175 |
Method and equipment for prediction of volcanic eruption and earthquake |
Aug. 31, 1993 |
| 5196698 |
Method and apparatus for nuclear logging using lithium detector assemblies |
Mar. 23, 1993 |
| 5175429 |
Stand-off compensation for nuclear MWD measurement |
Dec. 29, 1992 |
| 5171986 |
Methods and apparatus for calibration of BGO scintillator gamma ray energy spectra |
Dec. 15, 1992 |
| 5132540 |
Dead time correction and regulation method and apparatus for nuclear spectroscopy |
Jul. 21, 1992 |
| 5120955 |
Logging method and apparatus for correcting natural gamma ray measurements for borehole fluid effects by calculating a borehole correction factor and applying the correction factor to calculat |
Jun. 9, 1992 |
| 5091644 |
Method for analyzing formation data from a formation evaluation MWD logging tool |
Feb. 25, 1992 |
| 5083124 |
Nuclear logging tool electronics including programmable gain amplifier and peak detection circuits |
Jan. 21, 1992 |
| 5068531 |
Method and apparatus for producing a porosity log of a subsurface formation corrected for detector standoff |
Nov. 26, 1991 |
| 5067090 |
Nuclear spectroscopy method and apparatus for digital pulse height analysis |
Nov. 19, 1991 |
| 5055675 |
Pulse height analyzer for spectroscopy thermal multigate decay well logging system |
Oct. 8, 1991 |
| 5051581 |
Method and apparatus for epithermal neutron porosity well logging |
Sep. 24, 1991 |
| 5012091 |
Production logging tool for measuring fluid densities |
Apr. 30, 1991 |
| 4972082 |
Methods and apparatus for epithermal neutron logging |
Nov. 20, 1990 |
| 4918314 |
Gain stabilization circuit for photomultiplier tubes |
Apr. 17, 1990 |
| 4825071 |
Gamma ray borehole logging method and apparatus having compensation for borehole attenuation effects |
Apr. 25, 1989 |
| 4810876 |
Logging apparatus and method for determining absolute elemental concentrations of subsurface formations |
Mar. 7, 1989 |
| 4808368 |
High voltage supply for neutron tubes in well logging applications |
Feb. 28, 1989 |
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