By Stephen David Billings
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Extra info for Geophysics of Soil Mapping Using Airborne Gamma-Ray Spectrometry(Billings,PhD Thesis, 1998)
The process occurs in the presence of the Coulomb field of the nucleus and results in the annihilation of the photon and the creation of an electron-positron pair. 511 MeV. g. Tsoulfanidis, 1995). The total cross-section for a medium is a sum of the individual cross sections for the photoelectric effect, Compton scattering and pair production. g. Heath, 1964; Tsoulfanidis, 1995). Therefore, the main factor influencing the attenuation will be the electron density of the medium between source and receiver.
2 Calibration of radiometric surveys Any type of gamma ray survey, whether on the ground or in the air, requires calibration of the measuring system. This allows the raw count rates to be corrected for background interference and to correct for the complex effect of the detector and material between the source and detector on the gamma ray energy distribution. It also allows surveys flown at different times, heights or with different equipment to be meaningfully compared. Recommendations for calibration are given in IAEA (1991) and Grasty and Minty (1995).
The lake is ephemeral, an important bird habitat and covers parts of several dry land farms. In response to this threat, it was decided to develop a Land and Water Management Plan for the Jemalong-Wyldes Plains area. The object of the plan was to assess the impact of irrigation practices on the groundwater mound and develop appropriate management actions to eliminate/minimise the problem. 36 Central to the success of the plan was good quality information on soils, as soil characteristics largely determine the amount of water that enters the water table.
Geophysics of Soil Mapping Using Airborne Gamma-Ray Spectrometry(Billings,PhD Thesis, 1998) by Stephen David Billings