Laser radiation detection of the fluctuation alpha particle tracks in PADC

Abstract

The influence of different laser energy densities on PADC polymer is reported in this paper. The essential goal is to determine the variations in alpha particle track depths at different energy fluences of laser radiation in PADC detector. The maximal track depths of alpha particles can be unveiled in less etching time as the laser fluence increases. The maximum depth values of alpha tracks were 10.80 ± 0.16 µm, 10.70 ± 0.15 µm, 10.70 ± 0.15 µm, and 10.40 ± 0.14 µm, while saturation etching times were 2.75 ± 0.04, 3.00 ± 0.04, 3.25 ± 0.05, and 3.50 ± 0.05 h, corresponding to laser fluences of 21, 14, 7, and 0 J/cm². The V_b values are increasing with increased laser fluences. Samples exposed to laser radiation have a larger V_t value than unexposed counterparts, with higher increases recorded at higher laser fluences. Likewise, the laser irradiated samples showed a higher V value. The enhancement of the track growth on PADC is shown to be fluence dependent. The UV–Vis measurements revealed a higher absorbance spectrum for laser exposed samples. The optical band gap energy of PADC polymer is also decreased with increasing laser fluence. The free radical increases as the irradiation laser fluence increases, which causes a decrease in band gap energy in the PADC detector. The chemical alterations were also investigated based on Fourier Transform Infrared spectroscopy (FTIR). The net absorbance of some wavelengths of infrared spectra decreases slightly as laser fluence increases, correlated to the taking place of the scission process. However, an increase in absorbance is reported at specific wavelengths, indicating the production of OH groups during the photodegradation process.