Natural Radionuclides
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. Análises de fontes de fósforo na nutrição animal: técnicas nucleares e correlatas em estudos com coelhos
The first goal of this study was to assess inorganic and radiological aspects of eight different phosphorus sources: calcinated bone meal (FAR), dicalcium phosphate (BIC), super triple phosphate (FST), super simple phosphate (FSS), monoammonium phosphate (FMA), sulphur amonium phoshphate (FSA), ammoniated calcium polyphosphate (POLI) and a bovine mineral sup
Publicado em: 2008
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14. Dose de radiação ionizante decorrente do uso de fertilizantes agrícolas / Ionizing radiation dose due to the use of agricultural fertilizers
Among several agents that exist in the environment which can expose us to different risks and effects, there is the ionizing radiation whose knowledge of dose is of importance to the effective control and prevention of possible damages to human beings and to the environment. The transfer of radionuclides from fertilizers to/and soils to the foodstuffs can re
Publicado em: 2007
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15. DeterminaÃÃo de ÂÂ8U, ÂÂ6Ra, ÂÂ8Ra e 40K em uvas e vinhos da regiÃo do Vale do SÃo Francisco / Determination of 238U, 226Ra, 228Ra and 40K in grapes and wines of the Valley of the SÃo Francisco
A avaliaÃÃo dos teores de nutrientes em mostos e vinhos à de extrema importÃncia e tem despertado o interesse de muitos pesquisadores tendo em vista que estas anÃlises sÃo essenciais para o controle da qualidade e autenticidade do vinho. NÃo menos importante à a avaliaÃÃo do impacto causado pela presenÃa de contaminantes nos solos ou pela introdu�
Publicado em: 2007
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16. Determinação das doses efetivas por ingestão de farinhas de cereais atráves da espectrometria de raios gama
The health impact from radionuclides ingestion of foodstuffs was evaluated by the committed effective doses determined in commercial samples of South-Brazilian cereal flours (soy, wheat, corn, manioc, rye, oat, barley and rice flour). The radioactivity traces of 228Th, 228Ra, 226Ra, 40K, 7Be and 137Cs were measured by gamma-ray spectrometry employing a 66% r
Publicado em: 2006
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17. Teores de radionuclÃdeos em processos de extraÃÃo e de produÃÃo de petrÃleo no Nordeste do Brasil
Since the beginning of the twentieth century the presence of naturally occurring radioactive material (NORM) was detected in the water and oil extracted from wells both onshore and offshore. The oil is extracted together with water and sediments which contain radionuclides of the uranium and thorium series. Among the radionuclides present, especial attention
Publicado em: 2005
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18. AEROSOL CHARACTERIZATION IN A REGION WITH HIGH CONCENTRATION OF MINERAL SANDS. / CARACTERIZAÇÃO DE AEROSSÓIS EM UMA REGIÃO RICA EM AREIAS MONAZÍTICAS.
The main deposit of mineral sands in Brasil occur from the Rio Grande do Norte State to Rio de Janeiro State. The main commercial deposit is located in Buena, a village at São Francisco de Itabapoana, Rio de Janeiro State. In buena there is a plant that process minerals sands to obtain ilmenite, zirconite, rutile and monazite concentrates. This plant belong
Publicado em: 2003
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19. Efetividade das bentonitas na retenção de césio em produtos de rejeitos cimentados
The nuclear energy has been used for the human development in different areas, as in the medicine, in the agriculture, in the industry and in the environmental protection, besides the electricity generation. As in other activities, in the use of nuclear energy, residues are also generated. They are considered radioactive wastes when the contaminant content c
Publicado em: 2001
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20. Avaliação da atenuação da vegetação da Mata Atlantica a radiação gama natural emitida pela superficie
Several natural alpha, beta and gamma radionuclides are known. Most of them occur in rock-forming minerals Potassium, uranium and thorium are the main natural gamma radiation producers. This radiation can be measured in the laboratory, field or from aircrafts. In this case, besides atmospheric attenuation, vegetation can absorb substantial amounts of radiati
Publicado em: 1997
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21. Radiographic features of bone in several strains of laboratory mice and of their tumours induced by bone-seeking radionuclides.
The natural radiographic appearance of the various bones of the skeleton are described for several strains of laboratory mice. The Harwell substrains of CBA, A and 101 are generally similar and become osteoporotic on ageing. Harwell C57BL have similar, but more delicately chiseled, bones. Harwell C3H mice have bones with stouter cortices and may show osteosc