Zahra Mousa Hamza1
,Shaymaa Awad Kadhim2
and Hayder H. Hussein2,1
1Al-Furat Al-Awssat Technical University, Kufa Technical Institute, 31003, Najaf, Iraq.
2University of Kufa, Faculty of Science, Physics Department, Najaf-Iraq.
The study of radioactive nuclei concentrations in agricultural soils is a very important topic due to the contribution of
fertilizers in increasing these concentrations. Where the nucleus transition to food and then the human and endanger his life.
In this study, 24 samples of agricultural soils were taken from the Ghammas region, and a gamma-ray spectrometer system
connected with the NaI detector was used to measure the specific activity of the 226Ra, 232Th and 40K nuclei, the specific
activity values were varied from (5.87-26.16) Bq/kg with mean (15.780 Bq/kg) for 226Ra, (3.21-13.12) Bq/kg with average (8.596
Bq/kg) for 232Th and (253.6-532.6) Bq/kg with mean (393.012 Bq/kg) for 40K, respectively. Specific activity values showed that
there was only a significant increase in 40K concentrations in the Ghammas region, other than uranium and thorium
concentrations. External and internal hazard indices, outdoor and indoor absorbed doses and Radium equivalent activity are
also calculated, and Their values were less than the permissible limits except for one of the values of the indoor absorbed
dose was higher than the permissible limit. Potash fertilizers used in agricultural activities played an important role in
increasing indoor absorbed dose values.
Key words : NORMs, agricultural soil, Gamma spectroscopy, Ghammas, Iraq.