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Mostrando ítems 211-220 de 223
Artículo
Separation and measurement of Pa, Th and U isotopes in marine sediments by microwave-assisted digestion and MC ICP-MS
(AMER CHEMICAL SOC, 2009)
This manuscript describes a new protocol for determination of Pa/Th/U in marine sediments. Based on microwave-assisted digestion, it represents an important reduction of working time over conventional hot-plate digestion ...
Artículo
Behaviour and fluxes of natural radionuclides in the production process of a phosphoric acid plant
(PERGAMON-ELSEVIER SCIENCE LTD, 2009)
In recent years there has been an increasing awareness of the occupational and public hazards of the radiological impact of non-nuclear industries which process materials containing naturally occurring radionuclides. ...
Artículo
Rhenium measurements on North Atlantic seaweed samples by ID-ICP-MS: An observation on the Re concentration factors
(Springer, 2005)
The estimation of the Re concentration factor (CF) has been carried out to provide additional field information on the biochemical similarities between Re and Tc. Re concentration in brown seaweed samples from the North ...
Artículo
Tc-99 detection in water samples by ICP-MS
(Walter de Gruyter GmbH, 2004)
In this work three radiochemical procedures are presented for the determination of 99Tc in aqueous environmental samples by ICP-MS. Technetium is pre-concentrated from a dilute solution by a reduction-precipitation process ...
Artículo
External radiation assessment in a wet phosphoric acid production plant
(PERGAMON-ELSEVIER SCIENCE LTD, 2009)
The factories dedicated to the production of phosphoric acid by the so-called wet acid method are usually considered typical NORM industries, because the phosphate rock used as raw material usually contains high concentrations ...
Artículo
Overcoming ICP-QMS instrumental limitations for Tc-99 determination in environmental solid samples using radiochemistry
(PERGAMON-ELSEVIER SCIENCE LTD, 2006)
Besides its capabilities, quadrupole-based ICP-MS counting establishes several limitations on 99Tc analysis in environmental samples. Overcoming these limitations requires the use of radiochemical methods. We have developed ...
Artículo
A comparison between active and passive techniques for measurements of radon emanation factors
(PERGAMON-ELSEVIER SCIENCE LTD, 2009)
Some radon related parameters have been determined through two different techniques (passive and active) in soil and phosphogypsum samples. Emanation factors determined through these techniques show a good agreement for ...
Artículo
A short-time method to measure the radon potential of porous materials
(Elsevier, 2009)
The radiological risk associated with the use of solid materials has been traditionally established according to their radon exhalation rates, the accumulation chamber technique being the most widely used for the ...
Artículo
Transfer of Cd, Pb, Ra and U from Phosphogypsum Amended Soils to Tomato Plants
(Springer, 2009)
About 170 million tons of phosphogypsum (PG) are annually generated worldwide as a by-product of phosphoric acid factories. Agricultural uses of PG could become the main sink for this waste, which usually contains significant ...
Artículo
Radioactive impact in sediments from an estuarine system affected by industrial wastes releases
(Elsevier, 2002)
A big fertilizer industrial complex and a vast extension of phosphogypsum piles (12 km2), sited in the estuary formed by the Odiel and Tinto river mouths (southwest of Spain), are producing an unambiguous radioactive ...