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Journal Articles

Development of a long-range atmospheric transport model for nuclear emergency and its application to the Chernobyl nuclear accident

Terada, Hiroaki; Chino, Masamichi

Proceedings of 2nd International Conference on Radioactivity in the Environment, p.15 - 18, 2005/10

The previous version of Worldwide version of System for Prediction of Environmental Emergency Dose Information (WSPEEDI) has been composed of mass-consistent wind field model WSYNOP and particle dispersion model GEARN. Because WSYNOP has no capability to predict meteorological fields, its accuracy and resolution depends on meteorological input data, and it is impossible to treat physical processes realistically. To improve these problems, an atmospheric dynamic model MM5 is introduced and applied to the Chernobyl accident for the verification. Two calculation cases are conducted, CASE-1 a calculation for European region Domain-1, and CASE-2 a domain nesting calculation for Domain-1 and the region around Chernobyl Domain-2. The air concentration and surface deposition of $$^{137}Cs calculated by CASE-1 agree well with the measurements by statistical analysis and comparison for the horizontal distribution. In the result of CASE-2, the detailed distribution of surface $$^${137}$Cs deposition around Chernobyl which was impossible to calculate in CASE-1 is predicted with high accuracy.

Journal Articles

Model testing using data from accidental released of I-131 and Cs-137

Thiessen, K. M.*; Napier, B. A.*; Filistovic, V.*; Homma, Toshimitsu; Kany$'a$r, B*; Krajewski, P.*; Kryshev, A. I.*; Nedveckaite, T.*; N$'e$nyei, A.*; Sazykina, T. G.*; et al.

Proceedings from the International Conference on Radioactivity in the Environment, p.313 - 316, 2002/09

no abstracts in English

Journal Articles

Model testing using data on $$^{137}$$Cs from Chernobyl fallout in the Iput River catchment area of Russia

Thiessen, K. M.*; Sazykina, T. G.*; Apostoaei, A. I.*; Balonov, M.*; Crawford, J.*; Domel, R.*; Fesenko, S.*; Filistovic, V.*; Galeriu, D.*; Homma, Toshimitsu; et al.

Proceedings from the International Conference on Radioactivity in the Environment, p.317 - 320, 2002/09

no abstracts in English

Journal Articles

Marine environmental assessment system of radionuclides around Japan

Kobayashi, Takuya; Togawa, Orihiko

Proceedings from the International Conference on Radioactivity in the Environment (CD-ROM), 4 Pages, 2002/09

A marine environmental assessment system STEAMER is developing for predicting the short-term (30days) dispersion and assessing the collective dose to the Japanese population due to radionuclides released to the ocean. The computer code system for short-term predictions of radionuclide dispersion is a combination of the Princeton Ocean Model (POM) for predicting ocean currents and a particle random walk model SEA-GEARN for oceanic dispersion of dissolved radionuclides. The system has been applied to a hypothetical accident of a nuclear submarine if it sinks in an offshore region around Japan, by using measured currents, temperature, salinity and meteorological regional objective analysis data (RANAL). Another computer code system DSOCEAN is also applied to the same hypothetical accident in order to compare the results of radionuclide dispersion in the ocean and the collective dose to the Japanese population. An equidistant-grid compartment model combined with a model of the geostrophic current analysis is used in DSOCEAN.

Journal Articles

Real-time environmental contamination assessment system during nuclear emergency

Terada, Hiroaki; Furuno, Akiko; Chino, Masamichi

Proceedings from the International Conference on Radioactivity in the Environment (CD-ROM), 4 Pages, 2002/09

The present study aims to expanding the capability of WSPEEDI, so that it can be applied to atmospheric releases of radionuclides in the world for terrorist attack as well as nuclear accident. A terrorist attack would be possible in any time, any place and any scale. Altough WSPEEDI has already had a function to acquire global meteorological forecasts to generate a geographical map at arbitrary region in the world, it had no capability for simultaneous multi-scale predictions. Thus, the combination of models, non-hydrostatic meteorological model MM5 and atmospheric dispersion model GEARN, is introduced to WSPEEDI. MM5 can forecast local and regional meteorological condition simultaneously by domain nesting calculations. By the input of meteorological condition generated by MM5, GEARN can forecast multi-scale environmental contaminations considering detailed boundary layer and precipitation processes. Using this improved WSPEEDI, we made test calculations assuming a nuclear accident or terrorist attack in Asia.

Journal Articles

Environmental monitoring by integrating radon progeny monitors

Ishimori, Yuu; Furuta, Sadaaki

Proceedings of International Conference on Radioactivity in the Environment, 0 Pages, 2002/00

None

Journal Articles

Ocean General Circulation Model for Studying the Dispersion Radionuclides in the Global Ocean

Nakano, Masanao

Proceedings of International Conference on Radioactivity in the Environment, p.451 - 454, 2002/00

None

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