National Inst. of Radiological Sciences, Chiba (Japan) Corporate Source: (Code: 4485000) Conference Title: 20. National Institute of Radiological Sciences seminar on environmental research Chiba Conference Location: (Japan) Conference Date: 10-11 Dec (201 p) p 32-42 Publication Date: Mar 1993 CONF -921297-NIRS-M-93 Report Number(s): Order Number: DE94707693 Document Type: Analytic of a Report; Conference Literature Language: Japanese Journal Announcement: Availability: OSTI; \ : EDB9404 NTIS; INIS Research Abstracts); (Energy JPN (Japan (sent to DOE from) ) ERA Subfile: Exchange) . 1992 ETD (Energy Technology Data US DOE Project/NonDOE Project: NP Country of Origin: Japan Country of Publication: Japan Abstract: In Japan, systematic researches on marine environmental radioactivity started in 1954 when ‘Bikini incidence’ occurred. After several years of handling emergency situations, basic studies were carried out to understand processes and mechanisms of contamination of aquatic organisms by radionuclides. At this period ‘Hiyama Group’ hada large contribution to the development of this new field of research. Important concepts and items have already been dealt with in this Grant Group. Toward the end of ’Hiyama Group’, a new project started in Nuclear Safety Research Association. This project, so-called ’Kaihohtoku’, aimed at gathering necessary information for safety assessment on the release of low-level radioactive liquid wastes from a newly planned spent-fuel reprocessing plant at Tokai. NIRS-Nakaminato Branch was established first as Marine Radioecological Station in this project. The term 'radioecology’ got popularity also in this period. Many important results were obtained and scientific basis of the safety assessment was established in this project. Today we have not any urgent matter to be handled concerning radioecology in our coastal environment. Nuclides found are exclusively of fallout and of a quite low level. We have also established methodology of radiological assessment. So, what is the problem The problem is ‘from conservative to realistic’, which is the trend in the world. Here, from this viewpoint, some topics such as models and parameters including concentration factors and their validation and verification in the natural environment were discussed. Major Descriptors: (author). *AQUATIC ECOSYSTEMS -- RADIOECOLOGY Descriptors: AQUATIC ORGANISMS; CONTAMINATION; FOOD CHAINS; LIQUID WASTES; LOW-LEVEL RADIOACTIVE WASTES; NATURAL RADIOACTIVITY; RADIATION PROTECTION; RADIONUCLIDE MIGRATION Broader Terms: ECOLOGY; ECOSYSTEMS; ENVIRONMENTAL TRANSPORT; MASS TRANSFER; MATERIALS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; RADIOACTIVITY; ~ WASTES Subject Categories: 540330* -- Environment, Aquatic -- Radioactive Materials Monitoring & Transport -- (1990-) INIS Subject Categories: B3210* -- Water -- Radioactive materials--monitoring & transport -- (1992-) 10/5/302 03605380 (Item 2 from file: EDB-94-021346 103) Title: Possible differences in biological availability of isotopes of plutonium: Report of a workshop Author(s) /Editor(s): Kercher, J.R.; Gallegos, Corporate Source: G.M. (eds.) Lawrence Livermore National Lab., CA (United States) (Code: 9513035) Sponsoring Organization: DOE USDOE, Washington, DC (United States) Conference Title: Workshop on possible differences in biological availability of isotopes of Plutonium Conference Location: Las Vegas, NV (United States) Conference Date: Aug 1990 Publication Date: Sep 1993 (56 p) 9903653 28-29