نتایج جستجو برای: fallout radionuclide
تعداد نتایج: 46925 فیلتر نتایج به سال:
Uranium 236 is a long-lived radionuclide which is created from the naturally occurring trace isotope 235U (0.72% abundance) by thermal neutron capture. This process leads to a natural abundance of 236U in the range from 10-14—10-13 relative to the major 238U isotope (236U/238U). 236U is also created during the process of uranium enrichment for nuclear fuel or weapons, and as a waste product fro...
Recent years have seen increasing interest in the potential for using caesium-137 as a tracer in soil erosion investigations and caesium-137 measurements are now accepted as an effective and valuable means of producing retrospective information on medium-term rates and patterns of soil redistribution. There are, however, two important limitations to the general application of the approach. Thes...
Technetium-99 Behavior in the Terrestrial Environment Field Observations and Radiotracer Experiments
Obtaining data on 99Tc in the rice paddy field environment is important because Tc is a redox sensitive element. The behavior of Tc is expected to be different under upland field and rice paddy field conditions since the redox conditions in the soil environment differ. However, most of the data on the nuclide behavior in soil were obtained under upland field conditions. To understand the global...
The article presents data on the content and assessment of parameters artificial 137 Cs 90 Sr accumulation by steppe motley grasses in fallout area borehole 101 former ‘Sary-Uzen’ testing site Semipalatinsk Test Site (STS). activity concentration land cover study was found to reach 2,700 Bq/kg, – up 3,370 Bq/kg. ranges Tf values for (0.0030-0.021) (0.064-0.36) are one order magnitude each. is m...
The common mussel Mytilus galloprovincialis was selected as unique biomonitor species to implement a regional monitoring programme, the CIESM Mediterranean Mussel Watch (MMW), in the Mediterranean and Black Seas. As of today, and upon standardization of the methodological approach, the MMW Network has been able to quantify (137)Cs levels in mussels from 60 coastal stations and to produce the fi...
The dynamics of 137 Cs and 131 I radioactivity in the crude biomass grass fodder food vegetation Mazovia, Poland, 1986, year Chernobyl accident, has been estimated. Density soil have measured as a function rainfall density time most fallout took place. A method is described to convert instrumental data for radionuclide activity one type other types. results such conversion from lawn types are p...
The article presents the results of assessment levels emergency radionuclide discharge, gamma dose rates, fallout, as well prognosis public exposure doses to population Belarus a result possible severe nuclear accident at Belarusian NPP. It was found that, in case NPP with total activity accidental release 4.5∙1015 Bq, transfer radioactive contamination distance up 100 km from site under variou...
The contamination of Japan after the Fukushima accident has been investigated mainly for volatile fission products, but only sparsely for actinides such as plutonium. Only small releases of actinides were estimated in Fukushima. Plutonium is still omnipresent in the environment from previous atmospheric nuclear weapons tests. We investigated soil and plants sampled at different hot spots in Jap...
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