The process or processes that cause the time required for a given radionuclide to move between two locations to be greater than the groundwater travel time, because of physical and chemical interactio
ns between the radionuclide and the geohydrologic unit through which the radionuclide travels.
A pulsar that emits pulses in radio waves. The bulk of discovered pulsars are radio pulsars. There is a small number of pulsars that emit at optical wavelengths, X-ray wavelengths, and gamma-ray wavel
engths.
A pulsar that emits pulses in radio waves. The bulk of discovered pulsars are radio pulsars. There is a small number of pulsars that emit at optical wavelengths, X-ray wavelengths, and gamma-ray wavel
engths.
A type of quasar with weak radio emission. These types of quasars have strong emissions in both the optical and X-ray spectra. Within the optical spectrum, both broad and narrow emission lines are pre
sent. Their host is usually an elliptical galaxy, but less commonly, it might be a spiral.
A type of quasar with weak radio emission. These types of quasars have strong emissions in both the optical and X-ray spectra. Within the optical spectrum, both broad and narrow emission lines are pre
sent. Their host is usually an elliptical galaxy, but less commonly, it might be a spiral.