... the moment of neutron emission from the device to the moment the device records the gamma rays from neutron inelastic scattering (inelastic gamma rays, IGRs) in the formation. The time interval characterizes the distance to the point of origin of a gamma ray, and the energy of a gamma ray passing through...

... and the gamma transport theory, the distribution of capture gamma rays is described. A new neutron-gamma porosity measurement method is developed based on inelastic and capture gamma-ray distribution. The applicability of the new method in different environments is analyzed using the Monte Carlo method...

... of the factors influencing the accuracy of the results, which should be considered. We have adopted a method, based on the difference between the inelastic gamma-ray response of high- and low-energy windows, to reduce the impact of pair production upon calculating the bulk density. A new density estimation...

...Figure 11. Tally, material, and cutoff cards used to model inelastic gamma-ray counts for the Longhorn NGD LWD logging tool in MCNP. ...

...Oyinkansola Ajayi; Carlos Torres-Verdín; William E. Preeg ABSTRACT Neutron-induced gamma-ray spectroscopy measurements originate from inelastic neutron scattering and thermal neutron capture of chemical elements excited by neutrons; they are widely used to quantify in situ elemental and mineral...

... contributions; the neutron die-away log allows determination of saturation through casing; inelastic and capture gamma-ray spectroscopy provide various elemental determinations, including C/O and Si/Ca logs; and activation logging promises to furnish additional elemental measurements. A new log of photoelectric...

... Office of the Department of Energy, and the development, by USGS and Princeton Gamma-Tech, of the melting-cryogen-cooled high-purity germanium borehole gamma-ray detector. A technique of relating mass fractions to measured gamma-ray intensities, which eliminates the need for detailed knowledge...

... conditions. borehole geophysics logging log analysis inversion algorithm Spectroscopy logs measure gamma-ray counts as a function of energy. Gamma rays are emitted during high-energy inelastic neutron scattering or thermal-neutron capture. Elemental relative yields and weight concentrations...

.... These improvements plus future developments in gamma-ray spectral logs, neutron-gamma spectral logs, neutron activation logs, and neutron inelastic scattering logs promise a bright future for radioactivity logging. GeoRef, Copyright 2008, American Geological Institute. Reference includes data from Bibliography...

.../10.1016/j.jappgeo.2011.06.034 . JAGPEA 0926-9851 Roscoe B. A. Grau J. A. , 1988 , Response of the carbon/oxygen measurement for an inelastic gamma ray spectroscopy tool : SPE Formation Evaluation , 3 , 76 – 80 , doi: http://dx.doi.org/10.2118/14460-PA . SFEVEG 0885-923X Sa...

... 20.72 0.60 k 1 () − 0.51 − 0.31 − 12.57 − 6.00 k 2 () − 7.96 0.33 − 16.14 − 21.11 At gamma-ray detectors, inelastic gamma-ray counts G R are approximated with ∑ m = 0...

... their energy drops to the same level as the surrounding environment (thermal energy level), they get captured by the surrounding atoms. The neutron interactions of interest for pulsed-neutron logging are the inelastic and capture interactions. The energy and intensity of the gamma rays that are emitted...

... in petrophysical parameters between formations indicates that each formation is best analyzed individually. A comprehensive set of elemental dry weights was obtained using a new neutron-induced capture and inelastic gamma ray spectroscopy device ( Radtke et al., 2012 ). Laboratory wave-length-dispersive XRF...

...Figure 4. MDPNT quality control, showing. the tool operating parameters in tracks 1 and 2. Track 1 also includes the measured gamma ray response. Track 3 shows the measured sigma from the three detectors. The capture and inelastic counts for all the detectors are shown in tracks 4 and 5...

... was used for carbon content measurement while accounting for the system background interference. Accounting for Si-28 γ ray contributions to the carbon peak can be done by evaluating the intensity of 1.78-MeV γ rays due to INS on Si-28. Gamma rays with energies of 1.78 MeV due to Al-28 decay...