DETERMINATION OF GAMMA-EMITTING RADIONUCLIDES IN DUHOK CITY, IRAQ
Abstract
The present study assesses for the first time, the level of background radiation and the environmental radioactivity concentration in Duhok city using both gamma spectroscopy and dosimetry. The objective is to establish a baseline radiation level of the region. The city is located in the northwest in Kurdistan region of Iraq. Using gamma scout radiation meter (dosimetry), the average outdoor dose rate found in the field is 0.16 µSvh-1. Using shielded well type NaI (TI) detector for 30000 sec, the calculated absorbed dose rate in air from terrestrial radiation and 137Cs ranges 21.09-72.14 nGyh-1 with an average of 44.05±1.34 nGyh-1 which is below the world average value. The corresponding average annual effective dose rate is 0.054±0.002 mSvy-1. The mean deposition activity concentration of 137Cs is 9.17±0.47 Bqkg-1 and 17.25 Bqkg-1 for the non-intervened locations. Taking the non-intervened value, the expected contamination of the 137Cs fallout from the Chernobyl accident in 1986 is 30.2 Bqkg-1. Regarding the depleted uranium (DU) it is found that there is no significant DU trace at 20 sampling locations. Compared with other measurements in different countries we can conclude that the environment of the city is clean and suitable for living.References
J. P. Koplan, Toxicological Profile for Ionizing
Radiation, Agency for Toxic Substances and
Disease Registry, Atlanta, Georgia (1999).
K. Froehlich, Environmental Radionuclides:
Tracers and Timers of Terrestrial Processes,
a companion series to the Journal of
Environmental Radioactivity, Volume sixteen,
Elsevier B.V. (2010).
D. Williams, independent researcher, Eos,
UK, “UNEP Key issues for UN uranium
testing in Iraq, Implications of UNEP
recommendations for Depleted Uranium
studies in Iraqâ€, Copyright © Eos (2003).
S. F. Al-Najar, The Risk of Environmental
Radiological Pollution Consequences of the
use Radiological Depleted Uranium in South
of Iraq, M.Sc. Thesis, College of Science,
Mosul University, Iraq (2001).
UNSCEAR (1988) Ionizing Radiation Sources
and Biological Effects. United Nations
Scientific Committee on the Effects of Atomic
Radiation, Report to the General Assembly,
New York (1988).
K.A. Tawfiq Aga, Determinants of Investment Climate in the Iraqi Kurdistan Region,
M.Sc. Thesis, College of administration and
economics, Duhok University (2008).
A. I. Abdy, A Study of Some Engineering
Properties of (undisturbed and remolded)
desiccated Soils in Duhok Governorate,
M.Sc. Thesis, College of Engineering, Duhok
University (2003).
S. A. Faqeeh, Areal Expansion for Duhok
City Studying in City Geography, M.Sc.
Thesis, College of Arts, Slah Al. Deen
University (1999).
Gamma-Scout radiation detection, product of
gamma-scout Ltd. http://www.gammascout.com.
M. Pöschl and L. M. L. Nollet, Radionuclide
Concentrations in Food and the Environment,
Taylor & Francis Group, LLC, USA (2007).
S. Singh, A. Rani and R. K. Mahajan, J.
Radiat. Meas. 39 (2005) 431.
MCD-2, Dual Input Multi-scalar/Multichannel
Analyzer user Manual, FAST ComTec
Communication Technology GmbH, D-82041
Obreaching, Germany (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).
A. Manzoor, W. Mohammad, A. Mohammad,
Z.J. Hussain, A. Yasir and S. Farhan, Health
Physics 98, Suppl. 2 (2010) S69.
AVWIRI and G.O, J. Appl. Sci. Environ. Mgt.
, No.3 (2005) 27.
S. A. Husseini, J. Appl. Sci. 7, No.20 (2007)
A. Lahham, H. Al-Masri and A. Judeh, J.
Radiat. Protect. Dosim. 135 (2009) 0144.
M. Ngachin, M. Garavaglia, C. Giovani, M.G.
K. Njock and A. Nourreddine, J. Environ.
Radioactivity 99 (2008) 1056.
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)
A. Nada, T.M. Abd-El Maksoud, M. Abu-Zeid
Hosnia, T. El-Nagar and S. Awad, J. Appl.
Radiat. Isot. 67 (2009) 643.
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).