Results 151 to 160 of about 54,522 (197)
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Measurement of natural radionuclides in U.K. diet
Science of The Total Environment, 1984The levels of radium-226, lead-210 and polonium-210 in the U.K. diet have been determined. The important food groups contributing to the intake of these radionuclides have been identified. Seventy-five percent of the daily intake of radium-226 is derived from beverages, cereals, other vegetables, bread, sugars and preserves. Seventy-five percent of the
J L, Smith-Briggs, E J, Bradley
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Natural radionuclides in groundwaters
Journal of Radioanalytical and Nuclear Chemistry Articles, 1992The234U and230Th radionuclides are highly retarded by factors of 104 to 105 in basalt groundwater (Hanford) and briny groundwaters from Texas, and geothermal brine from the Salton Sea Geothermal Field (SSGF). In basalt groundwaters (low ionic strength), Ra is highly sorbed, while in brines (high ionic strength), Ra is soluble.
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Natural radionuclide-free phosphoric acid production
Journal of Radioanalytical and Nuclear Chemistry, 2003High-uranium phosphate rock from Itataia, Brazil, was milled for wet-process phosphoric acid production using the dihydrate method. Uranium contained in the phosphoric acid was recovered by solvent extraction. The distribution of long-lived natural radionuclides of the 238U and 232Th decay series involved in these operations was evaluated. 226Ra, 228Ra
H. T. Fukuma +2 more
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Natural radionuclides in human hair
2011Naturally occurring radionuclides of terrestrial origin, such as 238U, 235U, 226Ra, 210Po and 210Pb, are present to various degrees in all environmental media, including the human body. Like other pollutants, many natural radioactive substances also accumulate in hair. In this article, the transfer to human scalp hair and typical concentrations in hair
Maarit Muikku, Weibo Li
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Natural radionuclides in volcanic activity
Applied Radiation and Isotopes, 2003Abstract Natural radionuclides of 222 Ra, 210 Pb and 212 Pb present in the magma are emitted during the eruption of volcanoes. Depletion of 222 Rn in pumices and in lava showed that significant amounts of 222 Rn were released from erupting magmas. Atmospheric 210 Pb originating from the 1991 eruption of Mt. Pinatubo was detected in Japan and in
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Activity size distribution of natural radionuclides
Radiation Physics and Chemistry, 1994Abstract The activity size distributions of the natural radionuclides 7 Be, 210 Pb and 40 K were determined in the open air by means of γ spectroscopy. Size distributions of the radioactive aerosol particles were determined by using the low-pressure Berner cascade impactor (Model 20/0.015) as a sampling device. Moreover, the mass size distribution
A. El-Hussein, A.A. Ahmed
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Sorption of radionuclides on natural materials
Journal of Radioanalytical and Nuclear Chemistry Articles, 1986Information about the sorption of radionuclides on natural materials used for cementation of liquid radioactive wastes (RAW) is important for predictions of migration rates of radionuclides in the products of fixation. Cementation process for conditioning liquid RAW uses, besides cement, materials which improve quality of products.
G. Guliš, J. Timuîák
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Behavior of natural radionuclides in wastewater treatment plants
Journal of Environmental Radioactivity, 201256 samples, including influent, primary effluent, secondary effluent and final effluent wastewater from two Spanish municipal wastewater treatment plants (WWTPs), were analyzed to assess both the occurrence and behavior of natural radioactivity during 12 sampling campaigns carried out over the period 2007-2010.
A, Camacho +7 more
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Mercury-206: a New Natural Radionuclide
Nature, 1961ACCORDING to Cameron's mass formula1, the value of Q α for lead-210 (radium D) should be 3.566 MeV., which would indicate an alpha half-life of the order of 1010 years and an alpha-branching of the order of 10−9. The same source gives 1.361 MeV. for the Q β of the hitherto unknown mercury-206, which is formed from lead-210 by alpha decay. From a closed
M. NURMIA +6 more
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Adsorption of natural radionuclides on pyrolusite
Water, Air, and Soil Pollution, 1987Analysis of Ra, Th, and Po in water samples and low active effluents from a U mining and milling complex generally involves pre-concentration of samples carried out by co-precipitation or by evaporation. This paper describes an alternative method by way of adsorption of these radionuclides on pyrolusite pebbles in a column and their subsequent elution ...
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