High dose TL response of fly ash collected from coal fired thermal power plant

Abstract

In this present work we have reported the thermoluminescence properties of fly ash collected from Khaperkheda thermal power station, Nagpur, India. The behavior of the fly ash in powder form was investigated in a 60Co gamma field, in order to verify if it can be used as a dosimeter. Fly ash was irradiated to different doses of γ-rays varying from 10 kGy to 60 kGy. The linear response was observed up to 40 kGy of irradiation. Tm – Tstop method was used for the estimation of possible number of TL peaks present in glow curve of fly ash. The TL glow curve of fly ash was found to be consisting of four TL peaks at 141, 205, 285 and 347 °C respectively. Computerized glow curve deconvolution (CGCD) function was used for the deconvolution of TL glow curve to confirm the exact position of each peak present in the fly ash. Chen's peak shape method and initial rise method were used for the calculation of trapping parameters of observed glow peaks. The total lifetime of each glow peak was also calculated to show their stability at room temperature. The TL response of this fly ash may be considered to be satisfactory for applications in high-dose dosimetry.