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Optical modifications induced by proton irradiation in PM-355 solid state nuclear track detector

M. R. BAIG1,* , M. S. AL GARAWI1, S. MANSOOR ALI1, S. S. AL-GHAMDI1, A. KAYANI2

Affiliation

  1. Department of Physics and Astronomy, College of Science, P.O BOX 2455 King Saud university Riyadh Saudi Arabia
  2. Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA

Abstract

We report a study on the proton irradiation induced modifications on optical properties of PM-355 solid state nuclear track detector. The samples were irradiated by 6 MV Van de Graaff accelerators at various fluences. The reference as well as irradiated samples were subjected to UV–Visible spectral study, UV-Vis diffuse reflectance spectroscopy and Photoluminescence (PL) spectroscopy. In our study UV–Vis spectra reveals that absorption edge shifted towards longer wavelength region after proton irradiation, and this change is more significant increasing proton fluence. This shift clearly reflects decrease in optical band gap. The samples gradually appears transparent to the visible light and the material changes from transparent to yellowish with the increase in the fluence. It is believed that proton irradiation may induce defects and clusters in the PM-355 due to chain scission and cross linking as observed from PL spectral study..

Keywords

Proton irradiation, Optical modification, Band gap, Photoluminescence, Refractive index.

Submitted at: Sept. 17, 2015
Accepted at: Oct. 28, 2015

Citation

M. R. BAIG, M. S. AL GARAWI, S. MANSOOR ALI, S. S. AL-GHAMDI, A. KAYANI, Optical modifications induced by proton irradiation in PM-355 solid state nuclear track detector, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 11-12, pp. 1675-1679 (2015)