"Stream sediments" refers to the particles and rocks that are carried by flowing water in rivers or streams. These sediments can include dirt, sand, pebbles, or even larger rocks. Full definition
The level of radiation found in stream sediments at the disposal sites was about 650 times higher than radiation in upstream sediments. (sciencedaily.com)
More than seven years after Pennsylvania officials requested that the disposal of radium - laden fracking wastewater into surface waters be restricted, a new Duke University study finds that high levels of radioactivity persist in stream sediments at three disposal sites. (sciencedaily.com)
To conduct the study, they collected stream sediments from three wastewater disposal sites in western Pennsylvania, as well as three upstream sites, and analyzed the radioactive elements in the sediments. (sciencedaily.com)