Abstract
In this study, fly ash and bottom ash which are generated in Yatagan coal-fired thermal power plant in Mugla, Turkey and coal samples were analyzed by Canberra HPGe (high-purity Germanium detector) gamma ray spectrometry to determine the activity concentration of natural radionuclides such as 238 U, 226 Ra, 232 Th, 40 K and 210 Pb. Fly ash samples were collected at a total of 5 points along the emission control system of the thermal power plant, namely: the water pre-heater, (economizer), air preheater (LUVO) and the three rows of the electrostatic precipitators (ESP). Triplicate samples were collected from the same point, thus resulting in a total of 24 samples (coal, bottom ash and fly ash). The amount of collected samples was around 1 kg from each sampling point. The range of the activity concentrations obtained in this study were between 155±12 - 451±20 Bq kg -1 for 238 U, 187±7 - 563±20 Bq kg -1 for 226 Ra, 65±3 - 136±5 Bq kg -1 for 232 Th, 305±18 - 831±29 Bq kg -1 for 40 K and 186±20 - 1153±44 Bq kg -1 for 210 Pb. In this study, the activity index was calculated and the lowest activity index was found in the ash sample taken from water pre-heater point with a value of 2.37. If the building materials were to be prepared from the ash samples which were taken in this study at a proportion below 40%, the radiological issues can be ignored in terms of external gamma radiation.
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