[1] UNSCEAR, United Nations Scientific Committee on the Effects of Atomic Radiation. Exposure from natural sources of radiation, United Nations publication sales No. 10.IX.3. (2008) United Nations, United Nations Office at Vienna. [2] A. N. Al-Farsi. Radiological Aspect of Petroleum exploration and production in Sultanate of Oman. PhD thesis, Queensland University and Technology, (2008). [3] A.J. Wilson, L.M. Scot. Characterization of Radioactive Petroleum piping scale with an evaluation of subsequent land contamination. Health Physics, 63 (1992) 681-685. [4] http://shazandtpp.ir/ [5] International Atomic Energy Agency,Compliance Monitoring for remediated sites, IAEA-TECDOC-1415, IAEA, VIENNA, (2004). [6] UNSCEAR, United Nations Scientific Committee on the Effects of Atomic Radiation. Sources, effects and risks of ionizing radiation. New York: United Nations, (2000). [7] A. El- Taher, L. Najam, I. M. Omoniyi. Effect of Cement Factory Exhaust on Radiological Contents of Surrounding Soi l Samples in Assui t Province, Egypt Article in Journal of Physical Science • November.DOI: 0.21315/jps2017.28.3.9 [8] I. Bikit. Radioactivity of the soil in Vojvodina (northernprovince of Serbia and Montenegro). J. Environ. Radioact. 78 (2004) 11–19. [9] M. Tufail, N. Akhtar, M. Waqas. Measurement of terrestrial radiation for assessment of gamma dose from cultivated and barren saline soils of Faisalabad in Pakistan. Radiat. Meas. 41(2006) 443–451. [10] S.A. Issa. Radiometric assessment of natural radioactivity levels of agricultural soil samples collected in Dakahlia, Egypt. Radiat. Prot. Dosim. 56(1) (2013) 59-67. [11] W. Boukhenfouf, A. Boucenna. The radioactivity measurements in soils and fertilizers using gamma spectrometry technique. J. Environ. Radioact. 102 (2011) 336–339. [12] A. Nisar, M. Suhaimi Jaafar, M. S. Alsaffar. Natural radioactivity in virgin and agricultural soil and its environmental implications in Sungai Petani, Kedah, Malaysia. Pollut., 1(3) (2015) 305–313. [13] L. A. Najam, S. A. Younis. Assessment of natural radioactivity level in soil samples for selected regions in Nineveh Province (Iraq). Int. J. Novel Res. Phys. Chem. Math. 2(2) (2015) 1–9. [14] M.R Usikalu, A.B. Rabiu, K.D. Oyeyemi, J.A. Achuka, M. Maaza. Radiation hazard in soil from Ajaokuta North-central Nigeria. International Journal of Radiation Research. 15(2) (2017) 219-224. [15] H. Abbas, F.Z. Masoumeh. the Effect of Soil Radioactivity in Pollution. Journal of Community Health Research. 2(4) (2013) 286-292.