scholarly journals Naturally occurring radionuclides and Earth sciences

1997 ◽  
Vol 40 (5) ◽  
Author(s):  
G. Ferrara
Keyword(s):  
Earth Sciences ◽  
Isotopic Composition ◽  
Late Quaternary ◽  
Age Determination ◽  
Magma Genesis ◽  
Elemental Geochemistry ◽  
Mantle Evolution ◽  
Naturally Occurring ◽  
Naturally Occurring Radionuclides

Naturally occurring radionuclides are used in Earth sciences for two fundamental purposes: age determination of rocks and minerals and studies of variation of the isotopic composition of radiogenic nuclides. The methodologies that are in use today allow us to determine ages spanning from the Earth's age to the late Quaternary. The variations of isotopic composition of radiogenic nuclides can be applied to problems of mantle evolution, magma genesis and characterization with respect to different geodynamic situations and can provide valuable information not obtainable by elemental geochemistry.

Optimization of the selection of analysis methods for the determination of naturally occurring radionuclides

Kerntechnik ◽  
2008 ◽  
Vol 73 (3) ◽  
pp. 118-121
Author(s):  
T. Heinrich ◽  
L. Funke ◽  
M. Köhler ◽  
U.-K. Schkade ◽  
F. Ullrich ◽  
...  
Keyword(s):  
Naturally Occurring ◽  
Analysis Methods ◽  
Naturally Occurring Radionuclides ◽  
Selection Of

ROUTINE METHOD FOR THE DETERMINATION OF TRACE AMOUNTS OF 226Ra IN URINE BY ALPHA SPECTROMETRY

2019 ◽  
Vol 187 (2) ◽  
pp. 174-182
Author(s):  
Nicolas Guérin ◽  
Danielle McMullin ◽  
Xenia Fabian ◽  
Sheila Kramer-Tremblay ◽  
Alexandre Gagné ◽  
...  
Keyword(s):  
Organic Matter ◽  
Manganese Oxide ◽  
Urine Sample ◽  
Alpha Spectrometry ◽  
Barium Sulphate ◽  
Routine Method ◽  
Good Recovery ◽  
Naturally Occurring ◽  
Naturally Occurring Radionuclides

Abstract 226Ra is considered one of the most radiotoxic naturally occurring radionuclides. A new routine method was developed to measure traces of 226Ra in urine. Radium was pre-concentrated from a 2 l urine sample using manganese oxide (MnO2) particles. The MnO2 precipitate was dissolved and the organic matter was broken down. Then, potential radiological interferents were removed using DGA and AGMP1 stacked resin columns. A barium sulphate (BaSO4) micro-precipitation was performed before measuring the sample by alpha spectrometry. A good recovery of 60 ± 10% and excellent alpha resolution were obtained. The minimum detectable activity (MDA) was 0.2 ± 0.1 mBql−1. The method was validated using spiked samples and can be completed in 5 hours.

scholarly journals Determination of uranium isotope concentrations in precipitation in the vicinity of lignite-fired power plants

2011 ◽  
Vol 26 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Nick Papadopoulos ◽  
Angelos Efstathopoulos ◽  
Dimitrios Karangelos ◽  
Nick Petropoulos
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Point Of View ◽  
Uranium Isotope ◽  
Naturally Occurring ◽  
Naturally Occurring Radionuclides ◽  
Rainwater Sample ◽  
High Concentrations ◽  
Athens Area

Coal- and lignite-fired power plants produce significant amounts of fly ash, which in many cases contains high concentrations of naturally occurring radionuclides such as 238U. This is of importance from the radio-environmental point of view since a small portion of the fly ash escapes from the power plant filtering system and disperses in the surrounding atmosphere. In addition, coal- and lignite-fired plants related activities such as fuel mining and ash deposition contribute to the suspended matter in the air with particles containing naturally occurring radionuclides. In this study, rainwater samples were collected in the Megalopolis lignite field basin of the Arcadia prefecture in Greece, where lignite-fired power plants are in operation and related activities are fully developed. The samples were preconcentrated and analyzed with alpha spectrometry and kinetic phosphorescence analysis in order to determine the levels of uranium isotope concentrations in precipitation in the Megalopolis basin. A control rainwater sample was also collected in the Athens area to account for reference purposes. Concentrations determined via the two techniques were found to be in statistical agreement. The concentration of 238U in the samples collected at the Megalopolis basin varies from 2.2 ? 0.6 to 90 ? 14 mBq/L, and is 5-40 times higher than the concentration of 238U in the sample collected in Athens. This could be attributed to the operation of the lignite-fired power plants, the fossil fuel mines, and the ash depositories.

scholarly journals A fast method for the determination of 210Pb by LSC in liquid samples

2019 ◽  
Vol 7 (3) ◽  
Author(s):  
Camilla Da Silva Sampaio Lucena ◽  
Wanderson De Oliveira Sousa ◽  
Bernardo Maranhão Dantas
Keyword(s):  
Sequential Analysis ◽  
Liquid Scintillation ◽  
Point Of View ◽  
Fast Method ◽  
Secular Equilibrium ◽  
Naturally Occurring ◽  
The Earth ◽  
Naturally Occurring Radionuclides ◽  
Background Exposure

210Pb is a naturally occurring radionuclide, widely distributed on the earth´s surface and can be incorporated by humans through food chain or directly by ingestion or inhalation in situations of occupational or accidental exposures. It concentrates in bone tissue when absorbed, presenting a rather long biological half-life and producing one of the highest skeletal doses among naturally occurring radionuclides under conditions of average background exposure. Because of its metabolic and dosimetric characteristics, 210Pb becomes an important isotope from the radiation protection point of view. This work presents the development of a methodology for the determination of 210Pb by liquid scintillation. It is the modification of a sequential analysis for naturally occurring radionuclides in environmental samples without the need of waiting for secular equilibrium to be achieved with 210Bi. The methodology has shown to be precise, stable and provides consistent results when evaluated according to the criteria established in the Brazilian Intercomparison Program promoted by the IRD.

scholarly journals Determination of naturally occurring radionuclides in soil samples of Ayranci, Turkey

2015 ◽  
Vol 590 ◽  
pp. 012042 ◽  
Author(s):  
Osman Agar ◽  
Canel Eke ◽  
Ismail Boztosun ◽  
M. Emin Korkmaz
Keyword(s):  
Soil Samples ◽  
Naturally Occurring ◽  
Naturally Occurring Radionuclides

Determination of naturally occurring radionuclides in ultrapure organic liquids

1998 ◽  
Vol 360 (6) ◽  
pp. 664-668 ◽  
Author(s):  
R. v. Hentig ◽  
T. Goldbrunner ◽  
F. v. Feilitzsch ◽  
G. Angloher
Keyword(s):  
Organic Liquids ◽  
Naturally Occurring ◽  
Naturally Occurring Radionuclides
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