dose commitment of the returning population according to several pathways of exposure. Plutonium was detected in air and in the terrestrial and aquatic environment at concentrations that varied from background levels due to world-wide fallout to levels several orders-of-magnitude above. The dose commitments from plutonium via the terrestrial food chain and inhalation vary according to the postulated living pattern. The dosages via marine foods can be expected to be insensitive to living pattern and to exceed those via terrestrial foods. Plutonium would contribute nearly all of the dosage via inhalation, but this pathway ranks low in overall importance compared with the food-chain and external-dose pathways // Although the potential dose from plutonium via all pathways is low relative to that from $sup 608Co, $sup 90$Sr and S$sup 137$Cs, plutonium will still remain in the Atoll environment after the other major isotopes have decayed (auth) away. *AQUATIC ECOSYSTEMS--*RADIOECOLOGICAL CONCENTRATION; * Descriptors: HUMAN POPULATIONS--*DOSE COMMITMENTS; *PLUTONIUM--*RADIONUCLIDE MIGRATION; ENIWETOK; FOOD *TERRESTRIAL ECOSYSTEMS~-*RADIOECOLOGICAL CONCENTRATION; CHAINS; INHALATION; RADIATION DOSES; SURFACE AIR Environmental & Earth Sciences-Subject Codes (NSA): N44340* Radioactivity Monitoring & Transport--Ecosystems & Food Cycles; N44310 Environmental & Earth Sciences--Radioactivity Monitoring & Transport --Atmosphere (EDB): Subject Codes 510302* Environmental Sciences, Terrestrial-- Radioactive Materials Monitoring & Transport--Terrestrial Ecosystems & Food Chains 10/5/7 (Item 7 from file: 109) 1107986 NSA-33-009287 Plutonium in aqueous systems Schell, W.R. ; Watters, R.L. Univ. of Washington, Seattle Health Phys., v. 29, no. 4, pp. 589-597 Publication Date: Oct 1975 Coden: HLTPA Conference title: Proceedings of the second Los Alamos life sciences symposium Conference location: Los Alamos, NM, USA Conference date: 22 May 1974 Country of Publication: United Kingdom Journal Announcement: NSA33 Document Type: Conference paper Language: English Subfile: Abstracts) NSA Work Location: (Nuclear Science Abstracts); ERA (Energy Research United States A review has been made of the available information concerning plutonium soluble, and colloidal physical-chemical states. The plutonium is being injected into the water column from the sediments and has not been removed from the biogeochemical cycle after 16 yr. Concentrations of plutonium in vertebrates and invertebrates measured at Eniwetok were low and ranged from 0.001 to 0.2 pCi/g wet in fish muscle. Additional data are required to better evaluate the potential hazards to man of plutonium in the aquatic environment. (auth) Descriptors: *AQUATIC ECOSYSTEMS--*RADIOECOLOGICAL CONCENTRATION; * PLUTONIUM--*RADIONUCLIDE MIGRATION; ANIMALS; BIKINI; COLLOIDS; ENIWETOK; PARTICLES; PLANKTON; SEDIMENTS; SURFACE WATERS Subject Codes (NSA): N44340* Environmental & Earth Sciences-- 9003517 in the aquatic environment. The levels are low and the data on the environmental concentrations in the lake and marine environment @tre very limited. Of particular relevance to biological accumulation processes is the physical-chemical state of plutonium. Limited information is available in natural environmental waters. Indications are that the plankton has the highest concentration factors and that the concentration factors decrease with increasing complexity of the organisms. Recent studies of plutonium in water, sediment, and biota at Bikini and Eniwetok Atolls are given. The water samples measured indicate that plutonium exists in the particulate,