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Showing 3 results for 226ra
Dr. V. Changizi, Z. Jafarpoor, M. Naseri,
Volume 8, Issue 2 (9-2010)
Abstract
Background: The sources of radioactivity in the
environment have natural, terrestrial and extraterrestrial,
and anthropogenic origins. Plants may get radioactive
nuclides in two ways: (i) by the deposition of
radioactive fallout, (ii) by absorption from the soil.
Materials and Methods: The Concentrations of the
natural radionuclides (226Ra, 228Ra, 40K) and the
artificial radionuclide (137Cs) in leek and parsley in
Tehran province-Iran were determined using HPGe.
Also the effective dose due to the ingestion of such
vegetables by the population of Tehran province was
studied. Results: The average value of radionuclide
concentrations in parsley samples were measured
177.69 ± 12.47 mBq kg-1 fresh for 226Ra 349.62 ±
28.42 mBq kg-1 fresh for 228Ra 187364.6 mBq kg-1 fresh
for 40K. The average value of radionuclide concentrations
in leek samples were measured 94.31 ± 6.46
mBq kg-1 fresh for 226Ra 207.47 ± 19.46 mBq kg-1 fresh
for 228Ra 174555 ± 1704.21 mBq kg-1 fresh for 40K.
The concentrations of 137Cs in most of Parsley and
Leek samples were below the minimum detectable
activity (MDA). Conclusion: The Average 226Ra and
228Ra activities in 29 leek and parsley samples were
about 2.63 and 6.78 times the reference values,
respectively. The annual effective dose resulting from
the studied radionuclides for the adult population in
Tehran province were found to be safe in comparison
with normal background areas. Iran. J. Radiat. Res.,
2010 8 (2): 103-110
Dr. E. Tabar, H. Yakut,
Volume 12, Issue 3 (7-2014)
Abstract
Background: There is a rapid increase worldwide in the consumption of mineral waters which may contain different level of radioactive elements, especially 226Ra, in addition to varying amounts of beneficial salts. Therefore, a comprehensive study was planned and carried out in order to determine concentration of 226Ra natural radionuclide in bottled mineral waters that commercially available in Marmara Region of Turkey. Materials and Methods: The method used for 226Ra concentration analysis bases on the measurement of Radon (222Rn) coming from 226Ra dissolved in the water. The measurements were performed using RAD 7, a solid state α detector, with RAD H2O accessory manufactured by DURRIDGE COMPANY Inc. Results: The 226Ra concentration in mineral waters was found to vary from <0.074 to 0.625 Bql-1 with an average value of 0.267 Bql-1.The committed effective doses due to ingestion of 226Ra from the one year consumption of these waters were estimated to range from 10.8 to 90 µSvy-1, from 9 to 75 µSvy-1 and from 3.15 to 26.25 µSvy-1, for infants, children and adults, respectively. Conclusion: The results obtained in this study indicate that the committed effective doses are below the WHO (World Health Organization) recommended reference level of 100 µSvy-1.
Dr. S.y.l Mouandza, A.b. Moubissi, P.e. Abiama, T.b. Ekogo, G.h. Ben-Bolie,
Volume 16, Issue 4 (10-2018)
Abstract
Background: The present work aims to determine the activity concentrations of 226Ra, 233Th and 40K in soil samples collected in Mounana in the Southeastern region of Gabon, to evaluate the contribution of the natural. Materials and Methods: An HPGe p-type detector coupled with a multichannel analyzer DSA-1000 was used to perform measurements and process data. Data acquisition and analysis were made possible using Genie 2000 software version 2.1 and detector was calibrated using the IAEA certified soil reference standard material multi-gamma (No71863/3). Results: The activity concentrations of 226Ra,232Th and 40K varied respectively from 12 ± 03 Bq kg-1 to 23022 ± 2572 Bq kg-1, 12 ± 04 Bq kg-1 to 265 ± Bq kg-1 and64 ± 13 Bq kg-1 to 811 ± 74 Bq kg-1with means values of 2811 ± 198Bq kg-1, 63 ± 14 Bq kg-1 and of 355 ± 93 Bq kg-1wet weight. In order to assess the radiological risks due to primordial radionuclides in Mounana, the absorbed dose rate, effective dose, radium equivalent and external hazard index were estimated. Conclusion: Absorbed dose rates which have been calculated for each site varied from 26.12 nGy h-1 to 10817.99nGy h-1 with a mean value of 1352.76 nGy h-1. The mean value of annual effective dose was estimated to be 10.96 mSv y-1 from the studied area. The areas investigated in this study showed a strong radioactive contamination of sites inhabited by populations.
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