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The aim of this research is to detect nature radioactivity for gamma emitters (specific activity 238U, 232Th, and 40K) using NaI(Tl) detectors and alpha emitters (concentrations of 222Rn, 226Ra, and 238U) using CR-39 detectors in selected samples of grain that are collected from Kerbala governorate. Also, annual effective dose and some radiological parameters due to gamma and alpha emitters to assess the health risk were calculated. Results have been shown that the average value of specific activities for 238U, 232Th and 40K were 6.61±0.91 Bq/kg, 3.07±0.22 Bq/kg and 227.59±32.34 Bq/kg respectively, while the average value of alpha emitters concentrations for 222Rn, 226Ra, and 238U were 3.99±1.13 Bq/m3, 4.69±1.28 mBq/kg and 0.072±0.019 Bq/kg respectively. The results of average total of annual effective dose associated with the exposure due to gamma and alpha emitted from ingestion grain samples in the present study were 0.139±0.013 mSv/y and 0.172±0.047 µSv/y, respectively. The results of natural Radionuclide and radiological parameter hazard based on gamma and alpha emitters from grain samples were discovered to be within the world acceptable levels. Finally, natural radioactivity from the grain samples that collected from Kerbala governorate were safety for the human consumption.

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