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A comparison of individual doses for continuous annual unit releases of tritium and activation products into brackish water and lake-river ecosystems

Abstract

The annual effective doses to critical group from potential unit releases of tritium and activation products (32 nuclides) from a hypothetical fusion reactor into two aquatic environments, one with brackish water and the other with fresh water, are assessed. Unit continuous releases (1 Bq/year during 50 years) for each relevant activation product are analyzed, and the effective dose rate is calculated for each nuclide. The transfer of released activity is simulated by compartment models using first-order linear differential equations for the transport. The rate constants for the brackish-water ecosystem are based on measurements. Four exposure pathways are considered in the brackish water system, the Tvaeren Bay, (a) consumption of fish, (b) consumption of milk, (c) consumption of meat, and (d) exposure from swimming. For the freshwater system, five additional pathways are considered, namely consumption of (e) water, (f) vegetables, (g) cereals, and (h) root vegetables and (i) external exposure from contaminated ground. The paper presents the compartment models used and a description of how the exposure pathways are treated, especially the pathways via food consumption. The dominating exposure pathways are for most of the nuclides consumption of fish and water. For Ag-isotopes other exposure pathways, such as ground-shine, cereals and  More>>
Publication Date:
Dec 31, 1995
Product Type:
Technical Report
Report Number:
STUDSVIK-ES-95-14
Reference Number:
SCA: 540330; 560101; PA: AIX-26:076689; EDB-96:020815; NTS-96:008486; SN: 96001512298
Resource Relation:
Other Information: PBD: 1995
Subject:
54 ENVIRONMENTAL SCIENCES; 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; ENVIRONMENTAL EXPOSURE PATHWAY; COMPUTERIZED SIMULATION; RADIONUCLIDE MIGRATION; BALTIC SEA; ECOSYSTEMS; FOOD CHAINS; RADIATION DOSES; RADIOECOLOGICAL CONCENTRATION; RADIOECOLOGY; THERMONUCLEAR REACTORS; TRITIUM
OSTI ID:
168184
Research Organizations:
Studsvik Eco and Safety AB, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE96606236; ISBN 91-7010-267-8; TRN: SE9500136076689
Availability:
INIS; OSTI as DE96606236
Submitting Site:
SWDN
Size:
75 p.
Announcement Date:
Jan 30, 1996

Citation Formats

Edlund, O, and Aquilonius, K. A comparison of individual doses for continuous annual unit releases of tritium and activation products into brackish water and lake-river ecosystems. Sweden: N. p., 1995. Web.
Edlund, O, & Aquilonius, K. A comparison of individual doses for continuous annual unit releases of tritium and activation products into brackish water and lake-river ecosystems. Sweden.
Edlund, O, and Aquilonius, K. 1995. "A comparison of individual doses for continuous annual unit releases of tritium and activation products into brackish water and lake-river ecosystems." Sweden.
@misc{etde_168184,
title = {A comparison of individual doses for continuous annual unit releases of tritium and activation products into brackish water and lake-river ecosystems}
author = {Edlund, O, and Aquilonius, K}
abstractNote = {The annual effective doses to critical group from potential unit releases of tritium and activation products (32 nuclides) from a hypothetical fusion reactor into two aquatic environments, one with brackish water and the other with fresh water, are assessed. Unit continuous releases (1 Bq/year during 50 years) for each relevant activation product are analyzed, and the effective dose rate is calculated for each nuclide. The transfer of released activity is simulated by compartment models using first-order linear differential equations for the transport. The rate constants for the brackish-water ecosystem are based on measurements. Four exposure pathways are considered in the brackish water system, the Tvaeren Bay, (a) consumption of fish, (b) consumption of milk, (c) consumption of meat, and (d) exposure from swimming. For the freshwater system, five additional pathways are considered, namely consumption of (e) water, (f) vegetables, (g) cereals, and (h) root vegetables and (i) external exposure from contaminated ground. The paper presents the compartment models used and a description of how the exposure pathways are treated, especially the pathways via food consumption. The dominating exposure pathways are for most of the nuclides consumption of fish and water. For Ag-isotopes other exposure pathways, such as ground-shine, cereals and meat, are of importance. The results of this study show that individual annual effective doses attributed to unit releases of most of the nuclides to the lake-river system become 1.3-60 times lower than those released to the brackish-water system. The niobium isotopes, however, give a factor 2.5-4.8 higher dose. The reason to that is that the values of the bioaccumulation factor for these isotopes are higher in fresh water than in marine water. An uncertainty analysis is performed on each ecosystem and the results are obtained in the form of distributions. 38 refs, 29 tabs.}
place = {Sweden}
year = {1995}
month = {Dec}
}