Abstract
In this study, the amounts of activity concentrations of naturally occurring in 10 soil samples of the Tigris river and surrounding areas collected from deferent city of Baghdad have been investigated. Tigris river is an important water source for irrigation and drinking in Iraq. This study was done during 2018 in Protection Center of the Iraqi Ministry of Health and Environment using a high purity germanium detector. The resolution of (HPGe) at 2keV and 30% efficiency. The results of soil sample obtained showed that the effective activity concentration of 40K are ranged from 181.4 Bq/kg in sample S6 to 286.4 Bq/kg in S7. For Raeq values are ranged from 6 Bq/m3 in sample S5 to 17 Bq/m3 in sample S3. The obtained data revealed that the mean specific activity for 226Ra, 228Ac and 40k in these samples were less than World average. The artificial radionuclide represented by 137Cs was observed in some samples and vary from minimum value of detector ˂MDA to 7.5Bq/kg in sample S9 with an average value 3.842857 Bq/kg. Area around the site may attributed to the nuclear activities of this site or may be due to the nuclear accident (Chernobyl Catastrophe) which have been spread throughout a large area of the world including the samples locations were collecting.
Highlights
Human has always been exposed to ionizing radiation because of the multiplicity of its sources as found in the soil that we walk up on, the air we breathe, the water we drink, the food we eat and the building that we occupy [1]
Natural radioactivity arises mainly from primordial radionuclide's, such as 40K and the radionuclide's from 238U and 232Th series, which occur at trace levels in all ground formations [2]
From the view point of biological effect of radiation protecting, United Nations Scientific Committee on the Effects of Atomic Radiation established that the world mean dose from natural radiation sources of normal area is estimated to be 2.4 mSv/y while for all man-made is about 0.8 mSv/y [4]
Summary
Human has always been exposed to ionizing radiation because of the multiplicity of its sources as found in the soil that we walk up on, the air we breathe, the water we drink, the food we eat and the building that we occupy [1]. Natural occurring radionuclide's are widespread in the earth’s environment and it exists in all of them, e.g. geological formations in soil, water, air, rocks and plants. Natural radioactivity arises mainly from primordial radionuclide's, such as 40K and the radionuclide's from 238U and 232Th series, which occur at trace levels in all ground formations [2]. Radioactivity concentration and gamma-ray absorbed dose of the naturally occurring radionuclides (226Ra, 232Th series and 40K) and manmade radionuclide (137Cs) in the soil samples from the Tigris river In Baghdad Province using gamma-ray spectrometry. The samples were taken during January to March 2018 was taken up to almost one kilogram These samples are left 30 days to reach aquarium. The measurement were carried out at the Radiation Protection Center of the Iraqi Ministry of Health and Environment in 2018 using high purity germanium detector. 1kg of sample mass was used and stored for at least one month prior to measurements in order to attain radioactive secular equilibrium between 226Ra and 228Ac and their short-lived progeny
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