The concentrations of Natural Radioactivity in Fly Ash Released from Al-Dura thermal Power Plant in The south of Baghdad City

The concentrations of naturally radioactive made occurring and technically enhanced radioisotopes of fly ash samples, collected from Al-Dura thermal power Plant- south of Baghdad, have been investigated using the NaI(Tl) gamma-ray spectroscopy.The average Activity concentrations of the radio elements ²³⁸U, ²³²Th and ⁴⁰K in Fly ash samples are measured accurately and found to be 33.860, 32.6 and 644.64Bq/kg respectively.On the whole the radio nuclide's concentrations are still below the global average of 50 Bq/kg for ²³⁸U and ²³²Th, but are much higher in ⁴⁰K, relative to the global average, about 500 Bq/kg. The absorbed gamma doses in air, due to naturally occurring radionuclides in fly ash samples, are measured and found within the range; from 46.863 to 86.358 n Gy h^-1, which is higher than the world average, about 43 n Gy h^-1. As well as Fly Ash samples have had Radium equivalent activity (Ra_eq) with an average is about 138.82 Bq/kg. The radiation hazard indexes are calculated based on the above results and found lower than the maximum value.The overall average values of the H_ex and H_in indices have been found to be 0.37 and 0.32 respectively.Also, the overall average value of the representative gamma index (I_γr) for all fly ash samples is about 1.037, which are greater than the unity (>1). In this case, treatments to the NORM released from that station must be done