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چکیده
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ABSTRACT Introduction: Purpose of this study to determine the radioactivity in the agriculture soil of east-southern of Shazand Refinery Complex has been carried out for determining reliable base line data on the radiation level and to measure the radiation dose exposure to farmers and inhabitants of the studied area. Materials and Methods: Twenty one soil samples have been collected from two different lands. Sampling spots in the each land have been selected for the assessment of specific activities of radionuclides of 226Ra, 232Th, 40K and 137Cs using high purity germanium detector set up. Standards of International Atomic Energy Agency (IAEA) references material as named Reference Gamma ray Uranium (RGU), Reference Gamma ray Thorium (RGTh) and Reference Gamma ray Potassium (RGK) was used for quality control and determining efficiency calibration. Results: The specific activities of radionuclides 226Ra, 232Th, 40K and 137Cs varied from13.12 to 33.03, 11.3 to 35.86, 257.82 to 605.5 and 1.28 to 13.36 in Bq/kg respectively. For all samples calculated value of Radium equivalent (Raeq), Absorbed gamma dose rate (D), Internal Hazard Index (Hin), External radiation hazard (Hex), Annual Gonadal Dose Equivalent (AGDE),indoor and outdoor Annual effective dose equivalent (AEDE) in µSv/y, and excess lifetime cancer risk (ELCR). The results have been compared with other measurements in some countries and worldwide average. Conclusion: Results were found to be within the global reported safety limits. All samples were polluted by 137Cs fission product in low level. Therefore, no risk consequences for farmers and inhabitants of this region.
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