Browsing by Author "Akkaya G."

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Evaluation of radon concentration in well and tap waters in Bursa, Turkey
(2012-06-01) Akar Tarim U.; Gurler O.; Akkaya G.; Kilic N.; Yalcin S.; Kaynak G.; Gundogdu O.
222Rn measurements in water samples collected from 27 wells and 19 taps that were supplied from the investigated wells were conducted using the AlphaGUARD PQ 2000PRO radon gas analyser at sites across several geologic formations within the city of Bursa, Turkey. The measured radon concentrations ranged from 1.46 to 53.64 Bq l -1 for well water and from 0.91 to 12.58 Bq l -1 for tap water. Of the 27 sites sampled, only 7 had radon levels above the safe limit of 11.1 Bq l -1 recommended by the USEPA. In general, all determined concentrations were well below the 100 Bq l -1 revised reference level proposed by the European Union. These values of radon concentrations in water samples are compared with those reported from other countries. Doses resulting from the consumption of these waters were calculated. The minimum and the maximum annual mean effective doses due to 222Rn intake through water consumption were 0.02 mSv a -1 and 1.11 mSv a -1, respectively. © The Author 2011. Published by Oxford University Press.
Mosses beta radioactivity in Katirh mountain-Bursa, TURKEY
(2007-08-03) Kahraman A.G.; Kaynak G.; Akkaya G.; Gultekin A.; Gurler O.; Yalcin S.
Mosses are one of the most widely used procedures to determine via plant of radioactive contamination. The high concentrating capacity of mosses may be used as bioindicator of environmental radioactive contamination. In this study, the mosses were collected in region of Katirh Mountain in northwestern Turkey, activities were determined using TENNELEC LB 1000-PW detector. Samples of mosses growing on soil, rock, and tree bark were collected. © 2007 American Institute of Physics.
Radioactivity measurements in epiphytic lichens of Uludaǧ Mountain in Western Anatolia
(2013-01-01) Kahraman A.; Kaynak G.; Akkaya G.; Gürler O.; Yalçın S.
Activity concentrations of gross-β, naturally occurring 226 Ra, 232 Th, 210 Pb, 7 Be and anthropogenic 137 Cs in epiphytic lichens collected from Uludaǧ Mountain are presented and discussed with the aim of evaluating potential usability of lichens as a biomonitor. The activity concentrations of gross-β, 137 Cs, 40 K, 226 Ra, 232 Th, 210 Pb and 7 Be in the lichen samples were found to be in the range of 177-707, 4.05-94.26, 86-211, below detection limit (BDL) - 19.2, BDL - 14.0, 229-872, and 72.1-220.7 Bq kg -1 in dry weight, respectively. 137 Cs content in collected epiphytic lichens was in descending order: Parmelia sulcata > Lobaria pulmonaria > Pseudevernia furfuracea > Usnea filipendula. The best biomonitor for 137 Cs among the lichen species used in this study was determined as Parmelia sulcata. Pearson's correlation coefficient was calculated between 137 Cs and 40 K activity concentrations using a statistical package program (SPSS ver. 17.0) and a negative correlation value (R = -0,323, p = 0,222) was obtained. The highest 226 Ra and 232 Th activity concentrations were found in Boǧazova YaylasI which has a geological structure including granitic rocks. It was found that 137 Cs and 7 Be activity concentrations in species demonstrated an inverse behaviour. The effect of mean annual precipitation and temperature on 7 Be activity concentration was determined using multi regression analysis. Also, correlations between the 137 Cs and 7 Be, and 40 K and 7 Be were investigated. © 2012 Akadémiai Kiadó, Budapest, Hungary.