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1. WO2014123813 - CORRECTING GAMMA-RAY ENERGY SPECTRA FOR PILEUP DEGRADATION

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Publication Number WO/2014/123813
Publication Date 14.08.2014
International Application No. PCT/US2014/014450
International Filing Date 03.02.2014
IPC
G06F 19/00 2011.1
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
19Digital computing or data processing equipment or methods, specially adapted for specific applications
CPC
G01T 1/17
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
16Measuring radiation intensity
17Circuit arrangements not adapted to a particular type of detector
G01T 1/171
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
16Measuring radiation intensity
17Circuit arrangements not adapted to a particular type of detector
171Compensation of dead-time counting losses
G01T 1/36
GPHYSICS
01MEASURING; TESTING
TMEASUREMENT OF NUCLEAR OR X-RADIATION
1Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
36Measuring spectral distribution of X-rays or of nuclear radiation ; spectrometry
G01V 5/04
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
5Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
04specially adapted for well-logging
G01V 5/06
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
5Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
04specially adapted for well-logging
06for detecting naturally radioactive minerals
G01V 5/08
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
5Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
04specially adapted for well-logging
08using primary nuclear radiation sources or X-rays
Applicants
  • SCHLUMBERGER CANADA LIMITED [CA]/[CA] (CA)
  • SERVICES PETROLIERS SCHLUMBERGER [FR]/[FR] (FR)
  • SCHLUMBERGER HOLDINGS LIMITED (GB, JP, NL)
  • SCHLUMBERGER TECHNOLOGY B.V. [NL]/[NL] (AG, AL, AM, AT, AU, AZ, BA, BB, BE, BF, BG, BJ, BN, BR, BW, BY, BZ, CF, CG, CH, CI, CL, CM, CO, CR, CU, CY, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GA, GD, GE, GM, GN, GQ, GR, GT, GW, HN, HR, HU, ID, IE, IL, IR, IS, IT, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, MC, MD, ME, MG, MK, ML, MN, MR, MT, MW, MX, MY, NE, NI, NO, NZ, OM, PA, PE, PG, PL, PT, QA, RO, RS, RU, RW, SA, SC, SE, SG, SI, SK, SL, SM, SN, ST, SV, SZ, TD, TG, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, UZ, VC, ZA, ZM, ZW)
  • PRAD RESEARCH AND DEVELOPMENT LIMITED (AE, AO, BF, BH, BJ, CF, CG, CI, CM, CN, GA, GH, GN, GQ, GW, IN, KM, LY, MA, ML, MR, MZ, NA, NE, NG, PH, SD, SN, SY, TD, TG, VN)
  • SCHLUMBERGER TECHNOLOGY CORPORATION [US]/[US] (US)
Inventors
  • GRAU, James, A.
Agents
  • BERMAN, Jeremy
Priority Data
13/761,98207.02.2013US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) CORRECTING GAMMA-RAY ENERGY SPECTRA FOR PILEUP DEGRADATION
(FR) CORRECTION DE SPECTRES D'ÉNERGIE DE RAYONS GAMMA POUR DÉGRADATION D'EMPILEMENT
front page image
Abstract
(EN) A method for correcting detected gamma ray spectra for the effects of energy analyzer pileup includes assigning detected gamma rays to channels in a multichannel analyzer (MCA). A pileup spectrum is estimated. The pileup spectrum is subtracted from the measured spectrum. The result thereof is compared to the preceding estimated pileup free spectrum and the estimating the pileup spectrum, subtracting the pileup spectrum and comparing is repeated until the difference between successive estimates of the pileup-free spectrum falls below a selected threshold.
(FR) Selon la présente invention, un procédé de correction de spectres de rayons gamma détectés pour les effets d'empilement d'analyseur d'énergie comprend l'affectation de rayons gamma détectés à des canaux dans un analyseur multicanaux (MCA). Un spectre d'empilement est estimé. Le spectre d'empilement est soustrait du spectre mesuré. Le résultat de celui-ci est comparé au spectre exempt d'empilement estimé précédent et l'estimation du spectre d'empilement, la soustraction du spectre d'empilement et la comparaison sont répétées jusqu'à ce que la différence entre des estimations successives du spectre exempt d'empilement tombe au-dessous d'un seuil sélectionné.
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