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Title: Effect of gamma irradiation on opto-structural, dielectric, and thermoluminescence properties of natural phlogopite mica

Gamma ray induced modifications in natural phlogopite mica have been studied in the dose range of 1–2000 kGy. These modifications were monitored using different techniques viz: ultraviolet-visible spectroscopy, Fourier Transform Infrared spectroscopy, dielectric measurements, X-ray diffraction, and thermoluminescence dosimeter. The analysis of the results reveals that the dose of 100 kGy produces significant change in the natural phlogopite mica as compared to pristine and other exposed samples. Ultraviolet-visible analysis provides the value of optical indirect, direct band gap, and Urbach energy. Cody model was used to calculate structural disorder from Urbach energy. Different dielectric parameters such as dielectric constant, dielectric loss, ac conductivity, and real and imaginary parts of electric modulus were calculated for pristine and irradiated samples at room temperature. Williamson Hall analysis was employed to calculate crystallite size and micro-strain of pristine and irradiated sheets. No appreciable changes in characteristic bands were observed after irradiation, indicating that natural phlogopite mica is chemically stable. The natural phlogopite mica may be recommended as a thermoluminescent dosimeter for gamma dose within 1 kGy–300 kGy.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics, Guru Nanak Dev University, Amritsar 143005, Punjab (India)
  2. Inter University Accelerator Centre, New Delhi 110067 (India)
Publication Date:
OSTI Identifier:
22218111
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 9; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; DIELECTRIC MATERIALS; ELECTRIC CONDUCTIVITY; FOURIER TRANSFORM SPECTROMETERS; FOURIER TRANSFORMATION; GAMMA RADIATION; HALL EFFECT; INFRARED SPECTRA; IRRADIATION; MICA; PERMITTIVITY; THERMOLUMINESCENCE; THERMOLUMINESCENT DOSEMETERS; ULTRAVIOLET RADIATION; ULTRAVIOLET SPECTRA; VISIBLE SPECTRA; X-RAY DIFFRACTION