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Erscheinungsjahr
- 2016 (2) (entfernen)
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- Zeitschriftenartikel (2) (entfernen)
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- Englisch (2)
Schlagworte
- Annular space (1)
- Azimuthal temperature field (1)
- Azimuthal well logging (1)
- Bremsstrahlung (1)
- Direction-oriented image (1)
- Electron transport (1)
- Groundwater observation well (1)
- Modeling (1)
- Spectrum (1)
- Vertical fluid movement (1)
- X-ray (1)
Focus of this work is the detection of vertical movements behind the casing of groundwater observation wells within the seal. A new multi-methodical and azimuthal logging tool, named Azimuthal-Annulus-Convection-Identification (AACI)-Log has been developed and tested. The measurement concept of this probe is based on the combination of three azimuthal measuring logs – contact temperature on the inside of the casing wall, backscattered gamma-rays (gamma-gamma density), and natural radioactivity (gamma ray). Consequently, a direction-oriented image of the annular space can be derived. Not only the reason (void, potential channel) but also the resulting effect (vertical movement of fluids) can be detected with the Azimuthal-Annulus-Convection (AACI) – Log at the same time.
A fast quantitative model for the energy spectra of radiation emitted by X-ray tubes is described, handling thin as well as thick plane targets of arbitrary materials. The developed model is based on fundamental interaction cross sections, describing electron and photon transport via numerical integration of discretized distributions. While the focus lies on bremsstrahlung production, modeling of characteristic radiation is fully integrated. The model does not include any free parameters. The validity of the model is shown through comparison with measurements and Monte Carlo simulations for several combinations of target material and acceleration potential between 30 kV and 450 kV.