An activation log wherein the formations have been bombarded by high-energy neutrons. Specific atoms upon irradiation transform into isotopes which emit gamma rays exhibiting specific energy levels within the energy spectrum. Identification of the energy levels of the induced gamma radiation is a means of identifying the original atoms in place in the formation. The quantity of material containing the original atoms is deduced from the amount of gamma radiation at specific energy levels. Downhole instruments may use encapsulated sources, which emit neutrons continuously as the tool is moved along the formation wall, or neutron generators, which emit neutrons in cyclic pulses with measurements made between pulses. The type of source used depends on the substances searched for. Compare spectral gamma-ray log. Also see neutron activation.
terms:induced_spectral_gamma_ray_log
terms/induced_spectral_gamma_ray_log.txt · Last modified: 2023/11/22 08:41 by 127.0.0.1