[en] Two screening models were used to assess the potential risk of radionuclides present in sediment proposed for dredging. The proposed dredging site is located in Bayou Rigaud, Louisiana, USA. The receptors of concern for the project include aquatic ecological receptors, and members of the public and the crew of the ship. Two screening models used in the assessment were the RAD-BCG Calculator, an assessment screening model developed by United States Department of Energy and the Guidance on Radiological Assessment Procedures for the Protection of Human Health to Determine if Materials for Disposal at Sea are within the Scope of the London Convention 1972 currently being developed by the International Atomic Energy Agency. Both models were effectively used to assess the potential impact of radium-226, radium-228, and caesium-137 on aquatic biota and humans. (author)