Review of research on impacts to biota of discharges of naturally occurring radionuclides in produced water to the marine environment

► Produced water from offshore oil industry contains naturally occurring radionuclides. ► Published research on the impacts to biota from these radionuclides is reviewed. ► Review includes impact of added chemicals on the fate of discharged radionuclides. ► Studies indicate negligible risk to biota but substantial uncertainties remain.