FTIR spectroscopic technique for dose estimation at high dose region using Cr-39 track detector

The SSNTD (Solid State Nuclear Track Detector) technique by CR-39 is based on the track development by suitable etching followed by counting with an optical microscope. However, there exist limitations in use of CR-39 where large no of overlapping tracks are formed especially at high dose region. To overcome this limitation, the use of FTIR (Fourier-Transform Infrared) spectroscopic techniques can be implemented for radiation dosimetry at high doses. In this work, CR-39 detectors were irradiated to alpha particles using a ²³⁹Pu source (2.1±0.1 kBq) at different doses starting from 0.31 Gy to 5.12 Gy. After irradiation the detectors were subjected to chemical etching in steps of 1 hour followed by recording of FTIR spectra. It was observed that, the peak intensities of different bands decrease with dose