الملخص | The total count radiometric data of Karbala and Al-NajafQuadrangles (the map area) was analyzed and separated to its residual and regional (background) maps. The regional maps showed an increase in radiometric background from northwest towards the southeast, while the residual radiometric anomaly map showed three residual radiometric anomalies distributed in the map area.
Anomaly (R1) is located in the northwestern part of the map area,and coincides with Fatha, Injana Formation and Quaternary sediments (Inland sabkha, shallow depression sediments, sand sheet sediments),this anomaly is related mostly to the radioactivity of potassium element.
Anomaly (R2) is located in the midst of the map area,and coincides with Fatha, Injana, Euphrates, Dammam, Zahra Formation and Quaternary sediments (Inland sabkha, slope sediment, flood plain sediment and gypcrete),this anomaly is related mostly to the radioactivity of potassium element and less to uranium element.
Anomaly (R3) is located south of the map area,and coincide with Dammam, Euphrates Formation and Quaternary sediments (valley fill sediment),this anomaly is related mostly to the radioactivity of potassium element.
Acomparison between total count radiometric map and the geological map of the study area was carried out; it showed a radioactive range of each geologic formation and Quaternary sediments. It was concluded that, in general, the structural setting of the map area, which is characterized by existence of numerous surface and subsurface structures might play an important role in forming the radiometric anomalies of the map area.
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