ENVIRONMENTAL AND RADIOLOGICAL POLLUTION IN CREEK SEDIMENT AND WATER FROM DUHOK, IRAQ
Abstract
The activity concentrations of terrestrial ( 226Ra, 232Th and 40K) and anthropogenic gamma emitting radionuclides (137Cs) have been measured in 28 creek water and sediment samples randomly selected in different locations of Duhok governorate. The governorate is located in the northwest Kurdistan region of Iraq. Determination of the human health risk from the three exposure pathways (External radiation, Inhalation and Ingestion) was carried out. In addition, the chemical analysis was performed for the 13 surface water samples for reliability of physical results. Gamma spectroscopy system with a shielded well type NaI(TI) detector used for 40000 sec per sample. The data analysis included elemental concentrations, air absorbed dose rate, annual effective dose rate and external hazard index (radium equivalent activity). The average of 49.81±1.69 nGyh-1 in sediment and 21.19±1.32 nGyh-1 in water samples were below the world average value of 57nGyh-1. The corresponding annual effective dose rates outdoor estimated for sediment and surface water were 61.13±2.1µSvy-1 and 26.01±1.62 µSvy-1 respectively. The calculated external hazard indexes (Hex) 0.29+0.01 for sediment and 0.112+0.007 surface water samples. These values showed that all samples were well below the hazard limit of unity. The RESRAD-6.5 computer code was used to analyze the dose per unit release of a specified radionuclide and the health risk from the three exposure pathways. RESRAD code showed over estimation of the results of annual effective dose rates, even though the results were within the background level. The average value of activity concentrations of the radionuclides of sediment samples by the code was 0.108 mSvy-1 compared to our calculations. The probability of human cancer risk lifetime of a hypothetical contamination consisted of the highest value of the activity concentrations of terrestrial radionuclides and 137Cs is 17 people from 10000. The chemical analysis of the surface water samples showed compatibility with radiological results in terms of the solubility of isotopes. The radiological impact due to exposure pathways, as analyzed by RESRAD software and from other results indicated that the environment of the governorate was clean and suitable for living.References
A. M. Fan, Public Health Goal for Uranium in
Drinking Water, Office of Environmental
Health Hazard Assessment California
Environmental Protection Agency, August
(2001).
P. Vesterbacka, 238U–Series Radionuclides in
Finnish groundwater-based drinking Water
and Effective Doses, Radiation and Nuclear
Safety Authority, STUK, University of
Helsinki, Finland (2005).
A. A. Bin- Jaza and A. O. Bazohair, J. Abhath
Al-Yarmouk: Basic Sci. & Eng. (2007) 27.
S. Geras’kin, et al., Effects of radioactive
contamination on plant populations and
radiological protection of the environment,
EDP Sciences, Russia (2009).
National Research Council, Radiation Source
Use and Replacement Nuclear and Radiation
Studies Board Division on Earth and Life
Studies, National Academy of Sciences, USA
(2008).
A. Nada, et al., J. Appl. Radiat. Isotopes 67
(2009) 643.
K. Arshak, and O. Korostynska, Advanced
Materials and Techniques for Radiation
Dosimetry, Artech House, Inc. (2006).
Dilshad G. a. Ganjo nad EIa team,
Environmental Impact Assessment,
(EIA)report, Deralok Hydropower project,
Duhok/KRG-Iraq, Map.Com company (2008).
I. A. Abduljabbar, A study of Some
Engineering Properties of Undisturbed and
Eemolded Desiccated Soils in Duhok
governorate, M.Sc. Thesis, College
Engineering , Duhok University (2003).
Gamma-Scout radiation detection, product of
gamma-scout Ltd. http://www.gammascout.com.
M. Pöschl and M. L. Nollet , Radionuclide
Concentrations in Food and the Environment,
Taylor & Francis Group, LLC, USA (2007).
IAEA, Collection and preparation of bottom
sediment samples for analysis of
radionuclides and trace elements,
International Atomic Energy Agency, Vienna,
(2003).
V. Ramasamy, et al., Evaluation of Natural
Radionuclide Content in River Sediments and
Excess Lifetime Cancer Risk Due to Gamma
Radioactivity, Department of Physics,
Annamalai University, Annamalainagar, Tamilnadu, India, Maxwell Scientific Organization
(2009).
D. Fischer, History of the International Atomic
Energy Agency: the first forty years, Vienna,
IAEA, (1997).
M. Tzortzis and H. Tsertos, Gamma-ray
Measurements of Naturally Occurring
Radioactive Samples from Cyprus
Characteristic Geological Rocks, Department
of Physics, University of Cyprus, Nicosia,
(2002).
UNSCEAR, Sources, effects and risks of
ionization radiation, United Nations Scientific
Committee on the Effects of Atomic
Radiation, Report to the General Assembly,
with Annexes, New York (2000).
D. Malain, Measurements of NORM in
Environmental Samples, Department of
Physics, School of Electronics & Physical
Sciences, University of Surrey (2007).
C. Yu, et al., Environmental Assessment
Division, User’s Manual for RESRAD Version
, Operated by The University of Chicago,
United States Department of Energy, July
(2001).
G. R. Gilmore, Practical Gamma-ray
Spectrometry, 2nd Edition, Nuclear Training
Services Ltd. Warrington, UK (2008).
E. R. Faillace, J.-J. Cheng, C. Yu, RESRAD
Benchmarking Against Six Radiation Exposure Pathway Models, Argonne National Laboratory, 9700 South Cass Avenue,
Argonne, Illinois 60439, October (1994).
K.M.S. Abdullah and R.A. Ramadhan, The Nucleus 48, No. 4 (2011) 295.
A. Manzoor, et.al. Health Physics 98, Supplement 2 (2010) S69.
G. O. AVWIRI, J. Appl. Sci. Environ. Mgt. 9
No. 3 (2005) 27.
S. Singh, A. Rani and R. K. Mahajan, J.
Radiat. Meas. 39 (2005) 431.
I.C. Okeyode and A.M. Oluseye, J. Phys.
International 6, No.1 (2010) 1.
O. Kilic, M. Belivermis, S. Topcuoglu,
Y. Cotuk, M. Coskun., A. Cayir and R. Kucer,
J. Radiat. Protect. Dosim. 128, No. 3 (2008)