Raman and photoluminescence spectroscopy analysis of gamma irradiated human hair

Lam, Siok Ee and Nawi, Siti Nurasiah Mat and Sani, Siti Fairus Abdul and Khandaker, Mayeen Uddin and Bradley, David Andrew (2021) Raman and photoluminescence spectroscopy analysis of gamma irradiated human hair. Scientific Reports, 11 (1). ISSN 2045-2322, DOI https://doi.org/10.1038/s41598-021-86942-4.

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Preliminary study has been made of black human hair, carbon concentration of some 53%, a model in examining the potential of hair of the human head in retrospective and emergency biodosimetry applications, also offering effective atomic number near to that of water. The hair samples were exposed to 60Co gamma rays, delivering doses from 0 to 200 Gy. Structural alterations were observed, use being made of Raman and photoluminescence (PL) spectroscopy. Most prominent among the features observed in the first-order Raman spectra are the D and G peaks, appearing at 1370 +/- 18 cm- 1 and 1589 +/- 11 cm- 1 respectively, the intensity ratio I D/ I G indicating dose-dependent defects generation and annealing of structural alterations. The wavelengths of the PL absorption and emission peaks are found to be centred at 592.3 +/- 12.5 nm and 1077.4 +/- 7.3 nm, respectively. The hair samples mean band gap energy ( E g) post-irradiation was found to be 2.10 +/- 0.04 eV, of the order of a semiconductor and approximately two times the E g of other carbon-rich materials reported via the same methodology.

Item Type: Article
Funders: Sunway University Rewarding Research Output (GRTIN-RRO-102-2020)
Uncontrolled Keywords: Raman; Photoluminescence spectroscopy analysis; Gamma irradiated human hair
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms Zaharah Ramly
Date Deposited: 21 Jul 2022 08:27
Last Modified: 21 Jul 2022 08:27
URI: http://eprints.um.edu.my/id/eprint/28088

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