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  1 / 1314 MEDLINE  
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[PMID]:29353199
[Au] Autor:Sakuma K; Tsuji H; Hayashi S; Funaki H; Malins A; Yoshimura K; Kurikami H; Kitamura A; Iijima K; Hosomi M
[Ad] Endereço:Sector of Fukushima Research and Development, Japan Atomic Energy Agency, 10-2, Fukasaku, Miharu-machi, Tamura-gun, Fukushima 963-7700, Japan; Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan. Electronic address: sakuma.
[Ti] Título:Applicability of K for modelling dissolved Cs concentrations in Fukushima river water: Case study of the upstream Ota River.
[So] Source:J Environ Radioact;184-185:53-62, 2018 Apr.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A study is presented on the applicability of the distribution coefficient (K ) absorption/desorption model to simulate dissolved Cs concentrations in Fukushima river water. The upstream Ota River basin was simulated using GEneral-purpose Terrestrial Fluid-flow Simulator (GETFLOWS) for the period 1 January 2014 to 31 December 2015. Good agreement was obtained between the simulations and observations on water and suspended sediment fluxes, and on particulate bound Cs concentrations under both base and high flow conditions. By contrast the measured concentrations of dissolved Cs in the river water were much harder to reproduce with the simulations. By tuning the K values for large particles, it was possible to reproduce the mean dissolved Cs concentrations during base flow periods (observation: 0.32 Bq/L, simulation: 0.36 Bq/L). However neither the seasonal variability in the base flow dissolved Cs concentrations (0.14-0.53 Bq/L), nor the peaks in concentration that occurred during storms (0.18-0.88 Bq/L, mean: 0.55 Bq/L), could be reproduced with realistic simulation parameters. These discrepancies may be explained by microbial action and leaching from organic matter in forest litter providing an additional input of dissolved Cs to rivers, particularly over summer, and limitations of the K absorption/desorption model. It is recommended that future studies investigate these issues in order to improve simulations of dissolved Cs concentrations in Fukushima rivers.
[Mh] Termos MeSH primário: Radioisótopos de Césio/análise
Modelos Químicos
Monitoramento de Radiação/métodos
Poluentes Radioativos da Água/análise
Poluição Radioativa da Água/estatística & dados numéricos
[Mh] Termos MeSH secundário: Acidente Nuclear de Fukushima
Rios
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cesium Radioisotopes); 0 (Water Pollutants, Radioactive)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180220
[Lr] Data última revisão:
180220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180122
[St] Status:MEDLINE


  2 / 1314 MEDLINE  
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[PMID]:29227876
[Au] Autor:Inoue M; Shirotani Y; Yamashita S; Takata H; Kofuji H; Ambe D; Honda N; Yagi Y; Nagao S
[Ad] Endereço:Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan. Electronic address: i247811@staff.kanazawa-u.ac.jp.
[Ti] Título:Temporal and spatial variations of Cs and Cs levels in the Sea of Japan and Pacific coastal region: Implications for dispersion of FDNPP-derived radiocesium.
[So] Source:J Environ Radioact;182:142-150, 2018 Feb.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:To investigate the dispersion of Fukushima Dai-ichi Nuclear Power Plant (FDNPP)-derived radiocesium in the Sea of Japan and western Pacific coastal region and determine the sources of radiocesium in these areas, we examined the temporal and spatial variations of Cs and Cs concentrations (activities) during 2011-2016 in seawaters around the western Japanese Archipelago, particularly in the Sea of Japan. In May 2013, the surface concentration of Cs was ∼0.5 mBq/L (decay-corrected to March 11, 2011), and that of Cs exceeded the pre-accident level in this study area, where the effects of radiocesium depositions just after the FDNPP accident disappeared in surface waters in October 2011. Subsequently, radiocesium concentrations gradually increased during 2013-2016 (∼0.5-1 mBq/L for Cs), exhibiting approximately homogeneous distributions in each year. The temporal and spatial variations of Cs and Cs concentrations indicated that FDNPP-derived radiocesium around the western Japanese Archipelago, including the Sea of Japan, has been supported by the Kuroshio Current and its branch, Tsushima Warm Current, during 2013-2016. However, in the Sea of Japan, the penetration of Cs was limited to depths of less than ∼200 m during three years following the re-delivery of FDNPP-derived radiocesium.
[Mh] Termos MeSH primário: Radioisótopos de Césio/análise
Monitoramento de Radiação
Poluentes Radioativos da Água/análise
[Mh] Termos MeSH secundário: Acidente Nuclear de Fukushima
Japão
Cinza Radioativa/análise
Água do Mar/química
Poluição Radioativa da Água/estatística & dados numéricos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cesium Radioisotopes); 0 (Radioactive Fallout); 0 (Water Pollutants, Radioactive)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171228
[Lr] Data última revisão:
171228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171212
[St] Status:MEDLINE


  3 / 1314 MEDLINE  
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[PMID]:29195122
[Au] Autor:Gwynn JP; Heldal HE; Flo JK; Sværen I; Gäfvert T; Haanes H; Føyn L; Rudjord AL
[Ad] Endereço:Norwegian Radiation Protection Authority, The Fram Centre, N-9296 Tromsø, Norway. Electronic address: justin.gwynn@nrpa.no.
[Ti] Título:Norwegian monitoring (1990-2015) of the marine environment around the sunken nuclear submarine Komsomolets.
[So] Source:J Environ Radioact;182:52-62, 2018 Feb.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Norway has monitored the marine environment around the sunken Russian nuclear submarine Komsomolets since 1990. This study presents an overview of 25 years of Norwegian monitoring data (1990-2015). Komsomolets sank in 1989 at a depth of 1680 m in the Norwegian Sea while carrying two nuclear torpedoes in its armament. Subsequent Soviet and Russian expeditions to Komsomolets have shown that releases from the reactor have occurred and that the submarine has suffered considerable damage to its hulls. Norwegian monitoring detected Cs in surface sediments around Komsomolets in 1993 and 1994 and elevated activity concentrations of Cs in bottom seawater between 1991 and 1993. Since then and up to 2015, no increased activity concentrations of radionuclides above values typical for the Norwegian Sea have been observed in any environmental sample collected by Norwegian monitoring. In 2013 and 2015, Norwegian monitoring was carried out using an acoustic transponder on the sampling gear that allowed samples to be collected at precise locations, ∼20 m from the hull of Komsomolets. The observed Pu/ Pu activity ratios and Pu/ Pu atom ratios in surface sediments sampled close to Komsomolets in 2013 did not indicate any releases of Pu isotopes from reactor or the torpedo warheads. Rather, these values probably reflect the overprinting of global fallout ratios with fluxes of these Pu isotopes from long-range transport of authorised discharges from nuclear reprocessing facilities in Northern Europe. However, due to the depth at which Komsomolets lies, the collection of seawater and sediment samples in the immediate area around the submarine using traditional sampling techniques from surface vessels is not possible, even with the use of acoustic transponders. Further monitoring is required in order to have a clear understanding of the current status of Komsomolets as a potential source of radioactive contamination to the Norwegian marine environment. Such monitoring should involve the use of ROVs or submersibles in order to obtain samples next to and within the different compartments of the submarine.
[Mh] Termos MeSH primário: Monitoramento de Radiação
Navios
Poluentes Radioativos da Água/análise
[Mh] Termos MeSH secundário: Noruega
Água do Mar/química
Poluição Radioativa da Água/estatística & dados numéricos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Radioactive)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171228
[Lr] Data última revisão:
171228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171202
[St] Status:MEDLINE


  4 / 1314 MEDLINE  
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[PMID]:28926792
[Au] Autor:Zebracki M; Cagnat X; Gairoard S; Cariou N; Eyrolle-Boyer F; Boulet B; Antonelli C
[Ad] Endereço:IRSN/PRP-ENV/SESURE/LRTE, Saint-Paul-lez-Durance, France. Electronic address: mathilde.zebracki@irsn.fr.
[Ti] Título:U isotopes distribution in the Lower Rhone River and its implication on radionuclides disequilibrium within the decay series.
[So] Source:J Environ Radioact;178-179:279-289, 2017 Nov.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The large rivers are main pathways for the delivery of suspended sediments into coastal environments, affecting the biogeochemical fluxes and the ecosystem functioning. The radionuclides from U and Th-series can be used to understand the dynamic processes affecting both catchment soil erosion and sediment delivery to oceans. Based on annual water discharge the Rhone River represents the largest river of the Mediterranean Sea. The Rhone valley also represents the largest concentration in nuclear power plants in Europe. A radioactive disequilibrium between particulate Ra and U was observed in the suspended sediment discharged by the Lower Rhone River (Eyrolle et al. 2012), and a fraction of particulate Th was shown to derive from dissolved U (Zebracki et al. 2013). This extensive study has investigated the dissolved U isotopes distribution in the Lower Rhone River and its implication on particulate radionuclides disequilibrium within the decay series. The suspended sediment and filtered river waters were collected at low and high water discharges. During the 4-months of the study, two flood events generated by the Rhone southern tributaries were monitored. In river waters, the total U concentration and U isotopes distribution were obtained through Q-ICP-MS measurements. The Lower Rhone River has displayed non-conservative U-behavior, and the variations in U concentration between southern tributaries were related to the differences in bedrock lithology. The artificially occurring U was detected in the Rhone River at low water discharges, and was attributed to the liquid releases from nuclear industries located along the river. The ( U/ U) activity ratio (=AR) in river waters was representative of the U natural abundance on Earth. The ( Ra/ U) AR in suspended sediment has indicated a radioactive disequilibrium (average 1.3 ± 0.1). The excess of Th in suspended sediment =( Th ) was apparent solely at low water discharges. The activity of Th was calculated through gamma measurements and ranged from unquantifiable to 56 ± 14 Bq kg . The possibility of using Th as a tracer for the suspended sediment dynamics in large Mediterranean river was then discussed.
[Mh] Termos MeSH primário: Monitoramento de Radiação
Urânio/análise
Poluentes Radioativos da Água/análise
[Mh] Termos MeSH secundário: França
Sedimentos Geológicos
Rios
Suíça
Poluição Radioativa da Água/estatística & dados numéricos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Radioactive); 4OC371KSTK (Uranium)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171110
[Lr] Data última revisão:
171110
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170920
[St] Status:MEDLINE


  5 / 1314 MEDLINE  
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[PMID]:28915436
[Au] Autor:Al-Shboul KF; Alali AE; Batayneh IM; Al-Khodire HY
[Ad] Endereço:Department of Nuclear Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan. Electronic address: kfshboul@just.edu.jo.
[Ti] Título:Radiation hazards and lifetime risk assessment of tap water using liquid scintillation counting and high-resolution gamma spectrometry.
[So] Source:J Environ Radioact;178-179:245-252, 2017 Nov.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this work, two complementary techniques, viz. liquid scintillation counting and high-resolution gamma spectrometry are utilized to analyze radionuclides concentrations in tap water of Irbid governorate, Jordan, and study their correlation. Gross alpha and gross beta concentrations, in the tap water samples collected from the nine districts of Irbid governorate, ranged from <82 to 484 mBq/L with a mean of 295 mBq/L and from <216 to 984 mBq/L with a mean of 611 mBq/L, respectively. Furthermore, gamma spectrometry analysis, for the tap water samples, shows that the activity concentrations of Ra, Th, and K ranged between <19 and 302 mBq/L, 24 to 119 mBq/L, and <101 to 342 mBq/L, respectively. There was a weak or even no correlation among the identified natural radionuclides with no trace of artificial radioactivity. In addition, the results of both techniques show that storing tap water in drilled wells leads to higher levels of radioactivity concentrations beyond the international permissible limits. Furthermore, the average lifetime risk and annual effective dose received by age-grouped inhabitants due to direct and indirect tap water consumption are evaluated, where most of the received dose is attributed to Ra.
[Mh] Termos MeSH primário: Água Potável/química
Exposição à Radiação/estatística & dados numéricos
Monitoramento de Radiação
Poluição Radioativa da Água/estatística & dados numéricos
[Mh] Termos MeSH secundário: Seres Humanos
Jordânia
Dose de Radiação
Medição de Risco
Contagem de Cintilação
Espectrometria gama
Poluentes Radioativos da Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Drinking Water); 0 (Water Pollutants, Radioactive)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171110
[Lr] Data última revisão:
171110
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170916
[St] Status:MEDLINE


  6 / 1314 MEDLINE  
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[PMID]:28715276
[Au] Autor:Krestinina LY; Kharyuzov YE; Epiphanova SB; Tolstykh EI; Deltour I; Schüz J; Akleyev AV
[Ad] Endereço:a Urals Research Center for Radiation Medicine (URCRM), Chelyabinsk, Russian Federation.
[Ti] Título:Cancer Incidence after In Utero Exposure to Ionizing Radiation in Techa River Residents.
[So] Source:Radiat Res;188(3):314-324, 2017 Sep.
[Is] ISSN:1938-5404
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Health effects of in utero exposure to ionizing radiation, especially among adults, are still unclear. The aim of this study was to analyze cancer risk in a cohort of subjects exposed in utero due to releases of nuclear waste into the Techa River in the Southern Urals, taking into account additional postnatal exposure. Analysis for solid cancer was based on 242 cases among 10,482 cohort members, accumulating 381,948 person-years at risk, with follow-up from 1956-2009, while analysis for hematological malignancies was based on 26 cases among 11,070 persons, with 423,502 person-years at risk, with follow-up from 1953-2009. Mean doses accumulated in soft tissues and in red bone marrow during the prenatal period were 4 mGy and 30 mGy, respectively. Additional respective mean postnatal doses received by cohort members were 11 and 84 mGy. Poisson regression analysis was used to estimate the excess relative risk (ERR) of cancer incidence related to in utero and postnatal doses. No association was observed for in utero exposure with solid cancer risk [ERR per 10 mGy: -0.007; 95% confidence interval (CI): <-0.107; 0.148] or with hematological malignancy risk (ERR/10 mGy: -0.011; 95% CI: <-0.015; 0.099). However, ERR of solid cancer increased significantly with increasing postnatal dose (ERR/10 mGy: 0.11; 95% CI: 0.04; 0.22). The very wide confidence intervals in these ERR results are similar to those of studies performed on the LSS cohort and the offspring of the Mayak Female Worker Cohort, as well as case-control studies of effects after in utero medical exposure. There were limitations of this study, with decreased statistical power, due to the low prenatal doses received by most of the cohort members, the small number of cancer cases and the absence of cohort members over the age of 59 years (living cohort members had reached 49-59 years of age). Further aging of the cohort and extension of the follow-up period will enhance the statistical power of this study in the future. There is a shortage of cohort studies reporting on the effects of prenatal radiation exposure, as well as information on chronic exposure during the prenatal period. Therefore, further research of this unique cohort will be a useful addition to the published literature on this subject, and a valuable means of elucidating the long-term effects of low-dose radiation exposure in the fetus.
[Mh] Termos MeSH primário: Neoplasias Hematológicas/mortalidade
Neoplasias Induzidas por Radiação/mortalidade
Efeitos Tardios da Exposição Pré-Natal/mortalidade
Exposição à Radiação/estatística & dados numéricos
Poluição Radioativa da Água/estatística & dados numéricos
[Mh] Termos MeSH secundário: Adolescente
Adulto
Distribuição por Idade
Idoso
Criança
Pré-Escolar
Feminino
Seres Humanos
Incidência
Lactente
Recém-Nascido
Masculino
Meia-Idade
Gravidez
Dose de Radiação
Fatores de Risco
Federação Russa/epidemiologia
Distribuição por Sexo
Taxa de Sobrevida
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170919
[Lr] Data última revisão:
170919
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:170718
[St] Status:MEDLINE
[do] DOI:10.1667/RR14695.1


  7 / 1314 MEDLINE  
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[PMID]:28331119
[Au] Autor:Umata T
[Ad] Endereço:Radioisotope Research Center, Facility for Education and Research Support, University of Occupational and Environmental Health, Japan.
[Ti] Título:Estimation of Biological Effects of Tritium.
[So] Source:J UOEH;39(1):25-33, 2017.
[Is] ISSN:0387-821X
[Cp] País de publicação:Japan
[La] Idioma:jpn
[Ab] Resumo:Nuclear fusion technology is expected to create new energy in the future. However, nuclear fusion requires a large amount of tritium as a fuel, leading to concern about the exposure of radiation workers to tritium beta radiation. Furthermore, countermeasures for tritium-polluted water produced in decommissioning of the reactor at Fukushima Daiichi Nuclear Power Station may potentially cause health problems in radiation workers. Although, internal exposure to tritium at a low dose/low dose rate can be assumed, biological effect of tritium exposure is not negligible, because tritiated water (HTO) intake to the body via the mouth/inhalation/skin would lead to homogeneous distribution throughout the whole body. Furthermore, organically-bound tritium (OBT) stays in the body as parts of the molecules that comprise living organisms resulting in long-term exposure, and the chemical form of tritium should be considered. To evaluate the biological effect of tritium, the effect should be compared with that of other radiation types. Many studies have examined the relative biological effectiveness (RBE) of tritium. Hence, we report the RBE, which was obtained with radiation carcinogenesis classified as a stochastic effect, and serves as a reference for cancer risk. We also introduce the outline of the tritium experiment and the principle of a recently developed animal experimental system using transgenic mouse to detect the biological influence of radiation exposure at a low dose/low dose rate.
[Mh] Termos MeSH primário: Exposição Ocupacional/efeitos adversos
Eficiência Biológica Relativa
Trítio/efeitos adversos
Poluentes Radioativos da Água/efeitos adversos
Poluição Radioativa da Água
[Mh] Termos MeSH secundário: Animais
Seres Humanos
Camundongos
Camundongos Transgênicos
Neoplasias/etiologia
Dose de Radiação
Risco
Trítio/farmacocinética
Poluentes Radioativos da Água/farmacocinética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Radioactive); 10028-17-8 (Tritium)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:171015
[Lr] Data última revisão:
171015
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170324
[St] Status:MEDLINE
[do] DOI:10.7888/juoeh.39.25


  8 / 1314 MEDLINE  
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[PMID]:28235699
[Au] Autor:Chalupnik S; Wysocka M; Janson E; Chmielewska I; Wiesner M
[Ad] Endereço:Central Mining Institute, 40-166 Katowice, Pl. Gwarkow 1, Poland. Electronic address: schalupnik@gig.eu.
[Ti] Título:Long term changes in the concentration of radium in discharge waters of coal mines and Upper Silesian rivers.
[So] Source:J Environ Radioact;171:117-123, 2017 May.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:According to the latest guidelines of the International Atomic Energy Agency (IAEA, 2016), coal mining is one of the most important contributors to occupational exposure. Coal mining contributes about 45% of the total annual collective dose obtained by workers due to the exposure at places of working. One of the sources of exposure in mining are formation brines with elevated concentrations of natural radionuclides, the most common are radium Ra and Ra. Radium isotopes often occur in formation waters in underground collieries in the Upper Silesian region (USCB) in Poland. Significant amounts of radium remain underground in the form of radioactive deposits created as a result of spontaneous deposition or water treatment. This phenomenon leads to the increase of radiation hazard for miners. The remaining activities of Ra and Ra are released into the rivers with mine effluents, causing the contamination of bottom sediments and river banks. The results of radioactivity monitoring of effluents and river waters are presented here to illustrate a trend of long-term changes in environmental contamination, caused by mining industry in the Upper Silesian Region.
[Mh] Termos MeSH primário: Monitoramento de Radiação
Rádio (Elemento)/análise
Eliminação de Resíduos Líquidos
Poluentes Radioativos da Água/análise
Poluição Radioativa da Água/estatística & dados numéricos
[Mh] Termos MeSH secundário: Minas de Carvão
Exposição Ocupacional
Polônia
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Radioactive); W90AYD6R3Q (Radium)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170428
[Lr] Data última revisão:
170428
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170226
[St] Status:MEDLINE


  9 / 1314 MEDLINE  
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[PMID]:27931878
[Au] Autor:Hosseini A; Amundsen I; Brown J; Dowdall M; Karcher M; Kauker F; Schnur R
[Ad] Endereço:Norwegian Radiation Protection Authority, Po Box 55, N-1332, Østerås, Norway. Electronic address: ali.hosseini@nrpa.no.
[Ti] Título:Impacts on the marine environment in the case of a hypothetical accident involving the recovery of the dumped Russian submarine K-27, based on dispersion of Cs.
[So] Source:J Environ Radioact;167:170-179, 2017 Feb.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:There is increasing concern regarding the issue of dumped nuclear waste in the Arctic Seas and in particular dumped objects with Spent Nuclear Fuel (SNF). Amongst dumped objects in the Arctic, the dumped Russian submarine K-27 has received great attention as it contains two reactors with highly enriched fuel and lies at a depth of about 30 m under water. To address these concerns a health and environmental impact assessment has been undertaken. Marine dispersion of potentially released radionuclides as a consequence of different hypothetical accident scenarios was modelled using the model NAOSIM. The outputs from the dispersion modelling have been used as inputs to food-chain transfer and environmental dosimetry models. The annual effective doses for subsistence fishing communities of the Barents-Kara seas region do not exceed 0.6 mSv for hypothetical accidents located at Stepovogo fjord or the Barents Sea. For high rate consumers of fish in Norway, following a potential accident at the Gremikha Bay, annual effects doses would be at around 0.15 mSv. Accumulated doses (over 90 days) for various organisms and for all release scenarios considered were never in excess of 150 µGy. The levels of Cs derived for marine organism in areas close to Norway were not values that would likely cause concern from a regulatory perspective although for subsistence fishing communities close to the considered accident locations, it is not inconceivable that some restrictions on fishing etc. would need to be introduced.
[Mh] Termos MeSH primário: Radioisótopos de Césio/análise
Monitoramento de Radiação
Liberação Nociva de Radioativos
Navios/estatística & dados numéricos
Poluentes Radioativos da Água/análise
Poluição Radioativa da Água/estatística & dados numéricos
[Mh] Termos MeSH secundário: Resíduos Radioativos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cesium Radioisotopes); 0 (Radioactive Waste); 0 (Water Pollutants, Radioactive)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170414
[Lr] Data última revisão:
170414
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161210
[St] Status:MEDLINE


  10 / 1314 MEDLINE  
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[PMID]:27843066
[Au] Autor:Delmas M; Garcia-Sanchez L; Nicoulaud-Gouin V; Onda Y
[Ad] Endereço:Laboratory of Biogeochemistry, Bioavailability and Transfers of Radionuclides (L2BT), IRSN, Centre de Cadarache, bât. 183, BP 3, 13115 Saint-Paul-lez-Durance, France. Electronic address: magalie.delmas15@gmail.com.
[Ti] Título:Improving transfer functions to describe radiocesium wash-off fluxes for the Niida River by a Bayesian approach.
[So] Source:J Environ Radioact;167:100-109, 2017 Feb.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This paper proposed methodological refinements of the generic transfer function approach to reconstruct radiocesium wash-off fluxes from contaminated catchments, by the integration of hydrological descriptors (passed volume of water, flow rate fluctuations and antecedent flow conditions). The approach was applied to the Niida River (Fukushima prefecture, Japan) for the period 03/2011-03/2015, for which daily flow rate (m /s) and infrequent total radiocesium concentration (Bq/L) values were available from literature. Three models were defined, generic TF (Φ ), flow-corrected time variant (Φ ) and antecedent-flow corrected variant (Φ ). Calibration of these models' parameters was performed with a Bayesian approach because it is particularly adapted to limited datasets and censored information, and it provides parameters distributions. The model selection showed strong evidence of model Φ (indicated by marginal likelihood), which integrates current and recent hydrology in its formulation, and lower prediction errors (indicated by RMSE and ME). Models Φ and Φ better described wash-off dynamics compared to model Φ , due to the inclusion of one or several hydrological descriptors. From March 2011 to March 2015, model Φ estimated Cs export from Niida catchment between 0.32 and 0.67 TBq, with a median value of 0.49 TBq, which represents around 0.27% of the initial fallout and could represent a significant source-term to the Ocean compared to the direct release from Fukushima Dai-ichi Nuclear Power Plant (FDNPP). Moreover the remaining 99% of the initial radiocesium fallout within the catchment may constitute a persistent contamination source for wash-off. Although the proposed methodology brought improvements in the assessment of wash-off fluxes, it remains an empirical interpolation method with a limited predictive power, particularly for recent low activities. To improve predictions, modelling approaches require more observed data (particularly more activity values corresponding to more hydrological conditions), and the inclusion of more hydrological descriptors.
[Mh] Termos MeSH primário: Radioisótopos de Césio/análise
Acidente Nuclear de Fukushima
Poluentes Radioativos da Água/análise
Poluição Radioativa da Água/estatística & dados numéricos
[Mh] Termos MeSH secundário: Teorema de Bayes
Japão
Monitoramento de Radiação
Rios/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cesium Radioisotopes); 0 (Water Pollutants, Radioactive)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170414
[Lr] Data última revisão:
170414
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161116
[St] Status:MEDLINE



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