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Showing 2 results for Committed Effective Dose
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.
A.e. Ayodele, O.o. Ife-Adediran, A.m. Arogunjo,
Volume 18, Issue 2 (4-2020)
Abstract
Background: The increasing health effects of nuclear radiation occasioned by enhanced human activities in the environment necessitated the need for constant evaluation and assessment of radiological impact on the general populace within a confined developmental area. Hence, Ten (10) drilled well water samples were collected from various cities distributed across Ondo and Ekiti states and analyzed for gamma-emitting radiations. Materials and Methods: The collected water samples were analyzed using n-type co-axial HPGe detector (Canberra Inc, USA), to determine the activity concentrations of the gamma emitting radiations, which was used with dose conversion factors to calculate the age dependent total annual effective dose equivalents to six different age groups and the committed effective dose for the age group >17y. Results: Activity concentrations ranged from 2.25±0.39 to 35.61±6.22 Bq l-1232Th, 7.08±1.71 to 56.68±12.50 Bq l-1226Ra, 45.42±2.98 to 467.61±31.69 Bq l-140K and 1.66±0.46 to 25.55±5.76 Bq l-1232Th, 4.90±1.08 to 54.18±13.34 Bq l-1226Ra, 41.50±2.89 to 558.82±31.69 Bq l-140K, respectively for Ondo and Ekiti States . Furthermore, the mean total annual effective dose equivalent for the age groups was found to be within the range of (2.81 ± 0.46 – 26.91 ± 5.11) mSv/y and (4.71 ± 0.92 – 23.58 ± 5.12) mSv/y respectively for Ondo and Ekiti states. Conclusion: This is above the 1.0 mSv y-1 and 0.1mSv y-1 respectively set by ICRP and WHO. Hence, the drilled wells are recommended for water screening to remove radionuclides.
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