The naturally occurring activity concentration of radionuclides 226Ra, 232Th, 228Ra, 238U and 40K has been measured in different types of fertilizer samples used in Basrah Governorate using sodium iodide NaI(Tl) gamma spectrometry. The results of measurements showed that the mean value and range of specific activities for 226Ra, 232Th and 40K activities in the nitrogen, phosphorus and potassium fertilizers are 107.0±8.7 Bq/kg (8.6 - 410), 108.0±7.6 Bq/kg (4.1 - 397.5) and 1207.0±9.8Bq/kg (201.2 - 4237.7) Bq/kg, respectively. The maximum radium activity found in Crop Complex fertilizer with respect to organic fertilizers under investigation. Radium equivalent activity exceeds 370 Bq/kg, in some samples, the maximum permissible limit for radiation dose for all present samples. This study could be useful as baseline data for radiation exposure to fertilizers and their impact on human health.
