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1.
PLoS One ; 17(9): e0274070, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36129916

RESUMO

The unexpected accident at the Fukushima Daiichi Nuclear Power Station in Japan, which occurred on March 11th, 2011, after the Great East Japan Earthquake and tsunami struck the north-eastern coast of Japan, released radionuclides into the environment. Today, because of the amounts of radionuclides released and their relatively long half-life, the levels of radiocesium contaminating foodstuffs remain a significant food safety concern. Foodstuffs in Japan have been sampled and monitored for 134,137Cs since the accident. More than 2.5 million samples of foodstuffs have been examined with the results reported monthly during each Japanese fiscal year (FY, from April 1st to March 31st) from 2012 to 2021. A total of 5,695 samples of foodstuffs within the "general foodstuffs" category collected during this whole period and 13 foodstuffs within the "drinking water including soft drinks containing tea as a raw material" category sampled in FY 2012 were found to exceed the Japanese maximum permitted level (JML) set at 100 and 10 Bq/kg, respectively. No samples from the "milk and infant foodstuffs" category exceeded the JML (50 Bq/kg). The annual proportions of foodstuffs exceeding the JML in the "general foodstuffs" category varied between 0.37% and 2.57%, and were highest in FY 2012. The 134,137Cs concentration for more than 99% of the foodstuffs monitored and reported has been low and not exceeding the JML in recent years, except for those foodstuffs that are difficult to cultivate, feed or manage, such as wild mushrooms, plants, animals and fish. The monitoring data for foodstuffs show the current status of food safety risks from 134,137Cs contamination, particularly for cultured and aquaculture foodstuffs on the market in Japan.


Assuntos
Água Potável , Acidente Nuclear de Fukushima , Monitoramento de Radiação , Animais , Radioisótopos de Césio/análise , Água Potável/análise , Humanos , Japão , Centrais Nucleares , Monitoramento de Radiação/métodos , Chá
2.
Radiat Prot Dosimetry ; 198(13-15): 896-903, 2022 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-36083730

RESUMO

Environmental tritium are natural and anthropogenic origins, the distribution has spread in atmosphere, hydrosphere and biosphere as a variety of chemical forms. The natural tritium is produced by nuclear reactions of neutron with N and O in the upper atmosphere, the production rate changes with 11-year cycle of the solar activity. The production and radioactive decay of natural tritium is balanced on the whole earth, results in the inventory of about 1 EBq. Anthropogenic tritium by nuclear weapons testing had been released in 1950s-1960s, at highest intensity just before the Partial Test Ban Treaty in 1963, and the total release would be 186 EBq. In accordance with a peaceful use of nuclear energy, tritium has been releasing to the environment as airborne and liquid effluents from nuclear power plants and nuclear fuel reprocessing plants. The release from the nuclear power plants depends on the reactor type. Other sources are the tritium production facility of military purpose and the consumer products that use tritium as luminescent energy and disposed to landfill site. Internal dose is only concerned on tritium due to low decay energy, suggesting tritium concentrations in drinking water and food are critical for dose evaluation.


Assuntos
Poluentes Radioativos do Ar , Armas Nucleares , Poluentes Radioativos do Ar/análise , Atmosfera , Centrais Nucleares , Trítio/análise
3.
Radiat Prot Dosimetry ; 198(13-15): 1170-1174, 2022 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-36083733

RESUMO

According to the observed data of the activity concentration of $^{137}$Cs in Lake Onuma on Mount. Akagi, located in Gunma Prefecture, the decrease of the activity concentration slowed down since 2 years after the accident of Fukushima Daiichi Nuclear Power Plant. In the present study, we applied the time fractional diffusion equation to reproduce long-term changes in the time series of the activity concentration. In addition, we also reproduced the vertical distribution of the activity concentration with the parameter values, estimated by the time series data. We found that the model fit the observed data well for both time series and vertical distribution.


Assuntos
Acidente Nuclear de Fukushima , Monitoramento de Radiação , Poluentes Radioativos da Água , Radioisótopos de Césio/análise , Japão , Centrais Nucleares , Poluentes Radioativos da Água/análise
4.
Radiat Prot Dosimetry ; 198(13-15): 964-970, 2022 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-36083754

RESUMO

A tractor-based robot with the capability of real-time assessing and visualizing the radioactive material density and fertility distribution of farmlands has been developed to accelerate the recovery process of the farmlands suffered by the accident of the Fukushima Daiichi Nuclear Power Plant (FDNPP). In a field test at a decontaminated farmland near FDNPP, within-field heterogeneities of soil contamination and fertility are clarified almost in real-time. Results obtained by this robot are consistent with the map by the conventional soil sampling or the history of decontamination activities.


Assuntos
Acidente Nuclear de Fukushima , Monitoramento de Radiação , Robótica , Poluentes Radioativos do Solo , Radioisótopos de Césio/análise , Fazendas , Fertilidade , Japão , Centrais Nucleares , Monitoramento de Radiação/métodos , Solo , Poluentes Radioativos do Solo/análise
5.
Radiat Prot Dosimetry ; 198(13-15): 1030-1035, 2022 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-36083757

RESUMO

Radioactive Cs derived from the Fukushima Daiichi Nuclear Power Plant accident was detected in soils sampled at Kawasaki, Japan. Radioactive Cs adsorbed on soil is hard to be removed. Fixed-point observation of radioactive Cs concentration was performed on two observation sites of Meiji University. The soil samples were also analyzed for the distribution of radioactive Cs concentration and chemical form. 10 years after the accident, the activity concentration of radioactive Cs in soil samples at the Ikuta Campus of Meiji University ranged from 127 to 448 Bq kg-1. The sequential extraction method results indicated that most radioactive Cs in the surface soil exists in a poorly soluble form.


Assuntos
Acidente Nuclear de Fukushima , Monitoramento de Radiação , Poluentes Radioativos do Solo , Radioisótopos de Césio/análise , Humanos , Japão , Centrais Nucleares , Monitoramento de Radiação/métodos , Solo/química , Poluentes Radioativos do Solo/análise
6.
J Environ Manage ; 320: 115905, 2022 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-36056496

RESUMO

Vertical radiocesium concentration profiles and inventories in sediments were measured in Lake Kasumigaura following the 2011 Fukushima Dai-ichi Nuclear Power Plant accident. Further measurements of radiocesium concentrations in suspended solids (SS) have been conducted since September 2012 in the Koise and Sakura rivers inflowing into the lake. Cesium-137 (137Cs) accumulated intensively near the inflow outlets in the lake. At the lake center, the 137Cs inventory in sediments increased during 2011-2014; however, few changes were observed during 2014-2016. The 137Cs surface concentration and inventory decreased considerably in Tsuchiura-iri Bay until 3 years after the accident, indicating 137Cs migration. However, the rate of decrease subsequently slowed due to the 137Cs supply from the river. The 137Cs concentration in river SS declined during 2012-2015; however, it remained 1-2 orders of magnitude above its pre-accident level. The entrainment coefficient of particulate 137Cs in the inflows was initially higher in the Koise River but decreased exponentially more rapidly in the Koise River than in the Sakura River until 2015. Therefore, in the future, the difference in 137Cs concentrations will be smaller. The 137Cs concentration in the Koise River will continue to decrease; thus, the difference in the 137Cs inventory between the northern and southern parts of the lake will decrease. Total estimated amounts of 137Cs in the entire lake were 3.72 × 1012 Bq in December 2012 and 4.18 × 1012 Bq in August 2016. The accumulated amount of 137Cs in the entire lake based on sediment analysis was similar to the riverine input of particulate 137Cs based on riverine SS analysis from December 2012‒;August 2016, confirming the high trapping performance of the lake for particulate matter provided by the basin. Moreover, the amount of 137Cs accumulated in the lake in 2016 may have originated from comparable rates of atmospheric deposition and riverine input. These findings provide useful insights for future prediction and management of radiocesium contamination and the effects of riverine inputs in general shallow lakes.


Assuntos
Acidente Nuclear de Fukushima , Monitoramento de Radiação , Poluentes Radioativos da Água , Radioisótopos de Césio/análise , Japão , Lagos , Centrais Nucleares , Poluentes Radioativos da Água/análise
7.
Environ Monit Assess ; 194(10): 724, 2022 Sep 03.
Artigo em Inglês | MEDLINE | ID: mdl-36057743

RESUMO

Land use and land cover (LULC) change analysis of the construction site and its surroundings of the Akkuyu Nuclear Power Plant project in southern Turkey was undertaken in this case study, which was supported by remotely sensed Landsat 8 image composites. The composite images compiled in 2017 and 2021 were prepared on the Google Earth Engine platform. The Random Forest algorithm was used as the classifier model. A high classification performance was obtained for both images (kappa > 0.88, overall accuracy > 90%). After the classification process, LULC maps for both years were generated, and statistical calculations for the LULC change were computed for both the entire study area (15 × 25 km) and a buffer zone with a radius of 1 km around the power plant. In the whole study area, artificial surfaces significantly increased (78.46%), whereas forests (- 8.31%) and barren lands experienced a considerable decrease (- 6.11%). In the 1 km buffer, artificial surfaces predominantly increased (113.94%), while forests and barren lands decreased dramatically (- 69.13% and - 74.28%, respectively). The agricultural areas in the study area were changed into other LULC classes: 9.1% to artificial surfaces, 27.6% to barren lands, and 21.7% to forest. The rise in the area of artificial surfaces was especially noticeable within the 1 km buffer zone: construction activities converted 36.1% of agricultural fields, 54.1% of forests, and 23.2% of barren lands into artificial surfaces. The filling activities on the seashore resulted in a loss of water bodies of up to 26.5%. The study provides an overview of how the LULC classes have evolved on the construction site and in the region. In the end, the study discusses how the current land use preferences in the region contradict the issues and concerns mentioned in the existing body of literature.


Assuntos
Conservação dos Recursos Naturais , Monitoramento Ambiental , Agricultura , Conservação dos Recursos Naturais/métodos , Monitoramento Ambiental/métodos , Centrais Nucleares , Turquia
8.
Health Phys ; 123(4): 305-314, 2022 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-36049135

RESUMO

ABSTRACT: Awareness of radiation-related knowledge (RRK) and nuclear energy-related knowledge (NERK) among residents around a nuclear power plant (NPP), as well as their concerns about a NPP, were investigated. A face-to-face survey was conducted among 1,775 residents within 30 km around the NPP in Liaoning Province, China. A single-item Likert scale, Spearman's/Pearson's correlation coefficients, Student's t-test, ANOVA, and multiple-linear regression analysis were employed. Awareness of RRK and NERK among residents around the NPP was 27.7% and 36.6%, respectively. The anxiety level of respondents was negatively corelated with the distance from their residence to the NPP and age. Also, 55.6% of respondents thought that the publicity about nuclear energy/NPPs was insufficient, and 82.7% of respondents wanted to know relevant information about NPPs. Awareness of RRK and NERK among residents around the NPP was relatively low, which was related to education, occupation, and income. The anxiety level among residents was related to distance and age. The public was eager to know about RRK and NERK. These findings indicate that the publicity and education of RRK and NERK among residents around the NPP should be strengthened.


Assuntos
Energia Nuclear , Centrais Nucleares , Ansiedade/etiologia , China , Humanos , Inquéritos e Questionários
9.
Front Public Health ; 10: 839442, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36033793

RESUMO

This study examined whether disaster resilience affects the recovery of mental health states and mitigates psychosocial anxiety 10 years later the Fukushima Daiichi nuclear power plant accident. The survey was conducted in Fukushima's evacuation-directed and non-evacuation-directed areas in January 2020. The 695 participants responded to a questionnaire including items on radiation-related anxiety regarding the Fukushima Daiichi accident, an action-oriented approach as a resilience factor, psychological distress, and demographic information. The structural equation modeling showed that the action-oriented approach also eased radiation-related anxiety by mediating with improving mental health states. Moreover, a multi-group model analysis was conducted for evacuation-directed and non-directed areas. In the evacuation-directed area, we found stronger associations among resilience, mental health states, and radiation-related anxiety, and a direct effect of resilience factors on radiation risk anxiety. These findings emphasize the importance of resilience in post-disaster contexts, at least for a decade, where mental health deteriorates and various psychosocial issues become more complex.


Assuntos
Desastres , Acidente Nuclear de Fukushima , Ansiedade , Humanos , Saúde Mental , Centrais Nucleares
10.
J Radiol Prot ; 42(3)2022 Sep 05.
Artigo em Inglês | MEDLINE | ID: mdl-35998567

RESUMO

Disaster deaths can be classified into direct and indirect deaths. Direct deaths are those caused by the direct physical effects of disasters, such as earthquakes, tsunamis, and radiation exposure. Indirect deaths are those caused by secondary health effects such as emergency evacuation, relocation, evacuation environment, disruption of health care delivery services, and psychosocial effects. In addition, in Japan, the term disaster-related deaths refers to indirect deaths in accordance with the disaster condolence payments system, which provides relief for bereaved families. On 11 March 2011, the Great East Japan Earthquake exposed several issues related to disaster-related deaths in Japan. Therefore, on 1 February 2022, a symposium on disaster-related deaths hosted by this study was held on the website. The symposium discussed the issues and challenges associated with disaster-related deaths for future disaster preparedness. The authors introduced the concept of 'shaking' at the symposium by defining 'shaking' as 'the repeated changes in the social and living environment that worsen health conditions, regardless of the disaster'. It was also pointed out that vulnerable populations are more likely to experience more pronounced health effects. This generalised concept of 'shaking' associated with disaster-related deaths suggests that it is important to anticipate disasters before they occur to take specific preventive measures, targeted at vulnerable populations. This study found that disaster-related deaths in Japan create several problems in terms of future radiation disaster preparedness and medical countermeasures. In the future, there will be a need to examine the relevance of the issues of disaster-related deaths identified as a result of this symposium for future radiation disaster preparedness.


Assuntos
Desastres , Terremotos , Acidente Nuclear de Fukushima , Humanos , Japão/epidemiologia , Centrais Nucleares , Tsunamis
11.
Environ Pollut ; 311: 119962, 2022 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-35981638

RESUMO

We measured the concentrations of cesium isotopes (133Cs, 134Cs, and 137Cs) in zooplankton samples collected in waters off the east coast of Japan from May 2015 to June 2020. By combining these data with those obtained previously from May 2012 to February 2015, we evaluated the long-term impacts of the Fukushima Dai-ichi Nuclear Power Plant accident on marine zooplankton. Relatively high 137Cs concentrations in zooplankton, exceeding 10 Bq/kg-dry weight, were sporadically observed until June 2016, regardless of year or station. After May-June 2017, 137Cs concentrations decreased to below 1 Bq/kg-dry at most stations, and by May 2020, concentrations were below 0.5 Bq/kg-dry except those off Fukushima Prefecture. Since the accident, the 137Cs/133Cs atom ratios of zooplankton samples were higher than those of ambient seawater until 2019, but in May-June 2020 the ratios matched those of seawater except off Fukushima Prefecture. Highly radioactive particles were not detected in zooplankton samples by autoradiography using imaging plates after May-June 2017, although they were before. Therefore, the persistence of elevated 137Cs/133Cs ratios in zooplankton relative to seawater for nine years after the accident was probably due to the incorporation of highly radioactive particles (cesium-bearing particles or clay-mineral aggregates with highly adsorbed radiocesium) onto/into zooplankton for several years after the accident. However, since at least May-June 2017, these elevated ratios have likely been caused by small highly radioactive particles (or larger particles disaggregated into small pieces) entering the ocean from land via rivers or directly discharged from the Fukushima Nuclear Power Plant. Microplastics enriched with radiocesium with higher 137Cs/133Cs ratios than seawater may have also contributed 137Cs to the zooplankton.


Assuntos
Acidente Nuclear de Fukushima , Monitoramento de Radiação , Poluentes Radioativos da Água , Animais , Césio , Radioisótopos de Césio/análise , Japão , Centrais Nucleares , Plásticos , Poluentes Radioativos da Água/análise , Zooplâncton
12.
PLoS One ; 17(8): e0273684, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36037200

RESUMO

This study aimed to identify concerns related to returning to the Nagadoro district of Iitate Village, Fukushima Prefecture, Japan, in 2023 among its residents as it is designated as a difficult-to-return zone after the Fukushima Daiichi nuclear power plant accident. The following four concerns were extracted from the interviews and qualitative analysis: "Difficulties in restarting/continuing farming," which represent the difficulties in making a living from agriculture due to the absence of family members and neighbors, and the insufficient radiation decontamination; "Discriminatory treatment of products and residents from villagers," which suggests the presence of discriminations that residents of Nagadoro district are eccentrics and its agricultural products should not be treated together with those of other districts in the Village due to the recognition that the district is severely polluted by radiation; "Shift of the responsibility of returning home from the country to residents by scapegoating," which is characterized by the shift of responsibility from the government to the residents, including harsh social criticism of the residents of Nagadoro district for not returning even though the evacuation order has been lifted, when it should have been the government's responsibility to recover the district to a habitable state; "Loss of options for continued evacuation," which is the loss or weakening of the position of residents of the Nagadoro district who continue to evacuate, and of administrative compensation, resulting from the legal change that they are no longer "evacuees" after the evacuation order is lifted. The findings of this study will provide a foundation for the support of residents of the Nagadoro district after lifting the evacuation order scheduled for the spring of 2023. The findings may be transferable to the residents of other difficult-to-return zones expected to be lifted after the Nagadoro district and to also a radiation disaster-affected place in the future.


Assuntos
Desastres , Acidente Nuclear de Fukushima , Japão , Centrais Nucleares , Pesquisa Qualitativa , Estações do Ano
13.
PLoS One ; 17(8): e0269947, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35969598

RESUMO

Countless marine organisms were polluted with radioactive materials that were dispersed when the Fukushima Daiichi Nuclear Power Plant (FDNPP) was damaged in 2011 by the Great East Japan Earthquake. The aim of this study was to determine the degree to which marine herbivorous sea urchins, Mesocentrotus nudus, were contaminated with radiocesium because of the accident. We collected samples of sea urchins from four locations in Fukushima prefecture (at the coast and offshore from the Yotsukura and Ena stations) and investigated how the 137Cs activity concentrations changed. The biological half-life (Tbio) of 137Cs in the individual sea urchins was between 121 and 157 days. The ecological half-life (Teco) of 137Cs was 181-423 days and was high in places close to the FDNPP. The Teco values in the sea urchins were longer than previously reported. The results infer that the food sources of the sea urchins around the Fukushima coast strongly influenced their uptake of 137Cs.


Assuntos
Acidente Nuclear de Fukushima , Monitoramento de Radiação , Poluentes Radioativos da Água , Animais , Radioisótopos de Césio/análise , Japão , Centrais Nucleares , Ouriços-do-Mar , Poluentes Radioativos da Água/análise
14.
Int J Med Mushrooms ; 24(9): 25-40, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36004707

RESUMO

It has been 36 years since the Chernobyl Nuclear Power Plant catastrophe, but the consumption of wild mushrooms in Ukrainian Polissya is still dangerous since its territory is heavily contaminated by radionuclides. The aim of this study was to estimate 137Cs and 90Sr uptake in wild mushrooms from locations with contrast radioactive loads (Zhytomyr Polissya, Ukraine). In mushroom samples collected from Drevlyanskyi Nature Reserve since 2013 (average levels of soil surface contamination with 137Cs are 555-1480 kBq m-2), the highest levels of 137Cs were observed in symbiotroph species - Imleria badia (≤ 2680 kBq kg-1 dry mass [dm]), Tricholoma equestre (≤ 1420 kBq kg-1 dm), Lactarius rufus (≤ 602 kBq kg-1 dm), Sarcodon imbricatus (≤ 464 kBq kg-1 dm), Leccinum scabrum (≤ 117 kBq kg-1 dm), Suillus bovinus (≤ 118 kBq kg-1 dm), and Boletus edulis (≤ 96 kBq kg-1 dm). 90Sr activity was significantly lower, with the highest levels detected in Russula emetica (193 Bq kg-1 dm), Daedaleopsis confragosa (145 Bq kg-1 dm), and Hypholoma fasciculare (141 Bq kg-1 dm). The 137Cs/90Sr ratio in fruiting bodies in samples ranged from 6.1 (Bovistella utriformis) to 28,979 (T. equestre). Activity concentrations in mushrooms from locations with relatively low contamination with 137Cs (18.5-27.75 kBq m-2) also reached the highest values in symbiotroph species I. badia (7698 Bq kg-1 dm), Lactarius vellereus (6072 Bq kg-1 dm), and S. luteus (1448 Bq kg-1 dm). Potential calculated annual effective doses due to mushroom consumption by adults, considering only the effect of 137Cs, reached 0.311 and 8.71 mSv in B. edulis and I. badia from highly contaminated locations, respectively, and 0.0014 and 0.009 mSv in these species from low contaminated ones.


Assuntos
Agaricales , Acidente Nuclear de Chernobyl , Poluentes Radioativos do Solo , Adulto , Radioisótopos de Césio , Humanos , Centrais Nucleares , Poluentes Radioativos do Solo/análise , Radioisótopos de Estrôncio , Ucrânia
15.
Radiat Prot Dosimetry ; 198(9-11): 733-739, 2022 Aug 22.
Artigo em Inglês | MEDLINE | ID: mdl-36005960

RESUMO

The aim of this work is to propose methodology for estimations the characteristics of the radiation fields (and derived quantities from the field of dosimetry and radiation protection) in knowledge of a distribution of radionuclides released into the main production unit (or just a containment) area after a nuclear reactor accident. For such task stochastic Monte Carlo method has been chosen. Because of dimensions and thick shielding (concrete) barriers in the facility, application of the variance reduction techniques has been necessary. Monte Carlo code Monaco in sequence MAVRIC (from package SCALE 6.2.3) with variance reduction techniques using CADIS methodology has been employed for designing the proposed methodology. Procedure has been tested on a simulation model of a main production unit described by inspiration from the block of a nuclear power plant with a VVER-1000 reactor (installed in the Czech Republic, Central Europe).


Assuntos
Proteção Radiológica , Liberação Nociva de Radioativos , Simulação por Computador , Método de Monte Carlo , Centrais Nucleares , Doses de Radiação , Proteção Radiológica/métodos
16.
Radiat Prot Dosimetry ; 198(9-11): 740-746, 2022 Aug 22.
Artigo em Inglês | MEDLINE | ID: mdl-36005997

RESUMO

The amount and variety of information used during the nuclear decommissioning project is enormous. If we consider that data and information coming from the whole operational phase of a nuclear power plant (NPP) is important for safe and efficient planning of such projects and waste treatment, packaging, storage and disposal use data coming from the dismantling operations, we can expect that nuclear decommissioning data are live and can be useful for decades. Taking into account a very broad variety of such data (e.g. but not only, their format, storage media, structure, meaning, relevancy, …) it is not a trivial task to develop a complex and reasonably structured database for storing all this information. This paper presents an overview of our research activities in the field of standardization in terms of the data structure and storage technologies and outlines the overall 'single-source-of-truth' architecture with centralized server and communication principles for storage and transfer of data used in nuclear decommissioning projects.


Assuntos
Centrais Nucleares
18.
J Radiol Prot ; 42(2)2022 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-35775740

RESUMO

The Sostanj exercise of the Modelling and Data for Radiological Impact Assessments I Urban Environments Working Group took advantage of a set of measurement data from a 1991 tracer experiment to test atmospheric dispersion models for emissions from point sources over complex terrain. The data set included emissions of SO2from the stacks of the Sostanj Thermal Power Plant in Slovenia, measurements of the SO2at a number of locations in the surrounding area up to 7 km from the plant, and meteorological data from several monitoring stations, all as measured half-hour average values. Two sets of meteorological conditions were modelled: (a) a simple situation with a strong wind blowing from a point source directly towards a monitoring station; and (b) a complex situation involving a temperature inversion and convective mixing. The modelling results enable the assessment of the capabilities of various dispersion models in handling both complex terrain and complex meteorological situations.


Assuntos
Poluição do Ar , Centrais Nucleares , Poluição do Ar/análise , Vento
19.
J Environ Radioact ; 251-252: 106957, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-35792409

RESUMO

Tritium deposited in soil forms HTO and OBT. To further understand the changes of HTO and OBT in different years, HTO and OBT in the soil around Qinshan Nuclear Power Base in different sampling years were measured. According to the annual distribution of HTO and OBT in the surface soil, it could be inferred whether there was a long-term release of tritium in the observed year. From the depth distribution of different years, OBT tends to migrate to the deep. From 2015 to 2020, the correlation analysis between OBT and HTO/soil organic matter showed that HTO contributed more to OBT in surface soil at 250-2000 µm and 53-250 µm particle sizes, but this conclusion did not apply to deep soil. However, there was no significant relationship between OBT activity and soil organic matter content.


Assuntos
Centrais Nucleares , Monitoramento de Radiação , Tamanho da Partícula , Solo , Trítio/análise
20.
J Environ Radioact ; 251-252: 106964, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-35863270

RESUMO

A coupled hydrodynamic/lagrangian particle drift model was applied to obtain the distribution of key radionuclides that are dispersed at the surface water (upper 100 m) of Eastern Mediterranean Sea, in case of an accident of Nuclear Power Plant at Akkuyu. The model was applied to simulate the dispersion of key artificial radionuclide concentration, in case of a hypothetical accident to assess issues related to sea health and potential hazards. The released radionuclide was found to have a favorable westward direction, following the prevailing currents. The variability of the predicted pattern is interpreted according to the near surface circulation patterns in the study area. The dispersion of key radionuclides (137Cs, 238Pu and 131I) was studied in a spatial and temporal manner at the neighboring coasts of the location of the NPP. Furthermore, the fate of the plume was predicted for each month after the accident date close to the areas of Akkuyu, namely Cyprus, Rhodes Island, North Cretan coast, Cyclades and Syrian Coast. The annual study revealed that the radioactive plume is present with high concentration (maximum values of 1200 Bq m-3 for the long lived isotopes and 600 Bq m-3 for 131I) in the location of the plant for short period of time (1-2 months), while the other areas are affected during the whole year with low level of activity concentration (20-50 Bqm-3). The ERICA Assessment Tool was also used to evaluate dose rates to common marine biota at the studied areas.


Assuntos
Acidente Nuclear de Fukushima , Monitoramento de Radiação , Poluentes Radioativos da Água , Acidentes , Radioisótopos de Césio/análise , Radioisótopos do Iodo , Mar Mediterrâneo , Centrais Nucleares , Poluentes Radioativos da Água/análise
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