Background
Type: Article

238U, 232Th, 40K and 137Cs activity concentrations along the southern coast of the Caspian Sea, Iran

Journal: Marine Pollution Bulletin (0025326X)Year: May 2009Volume: 58Issue: Pages: 658 - 662
DOI:10.1016/j.marpolbul.2009.01.009Language: English

Abstract

The determination of activity concentrations of the radioactive elements 238U, 232Th, 40K and 137Cs was performed on grab samples taken from a polluted environment. The samples were sliced into strata from 5 cm depth, dried and ground to sieved through a 170 mesh size prior to the analysis. Activity concentration was quantified using gamma spectroscopy. The results showed that the concentrations of activity in the sediment samples are 177 ± 12.4, 117 ± 11.5, 1085 ± 101.6 and 131 ± 4.8 Bq kg-1 for 238U, 232Th, 40K and 137Cs, respectively. In general, the distribution of activity concentrations along the southern coast of the Caspian Sea area exceeded international limits. The hazard index of the samples was 0.19-0.88, with an average of 0.49. The mean values of radium equivalent activity and dose rate are 176 Bq kg-1 and 63 nGy h-1, respectively. © 2009 Elsevier Ltd. All rights reserved.


Author Keywords

Activity concentrationCaspian SeaCs-137K-40Th-232U-238

Other Keywords

Elements, RadioactiveEnvironmental MonitoringGeologic SedimentsIranOceans and SeasWater Pollutants, RadioactiveCaspian SeaEurasiaCesiumCoastal engineeringLandformsRadioactive elementsRadiumUltraviolet spectroscopycesium 137potassium 40thorium 232uranium 238radioactive elementActivity concentrationCs-137K-40Th-232U-238cesium isotopeconcentration (composition)potassiumradioactivitythorium isotopeuranium isotopearticleconcentration (parameters)gamma spectrometrysea pollutionsedimentseawater pollutantConcentration (process)