Raman and photoluminescence spectroscopy analysis of gamma irradiated human hair

Document Type

Article

Publication Date

4-12-2021

Abstract

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.

Keywords

Raman, Photoluminescence spectroscopy analysis, Gamma irradiated human hair

Publication Title

Scientific Reports

Divisions

PHYSICS

Funders

Sunway University Rewarding Research Output (GRTIN-RRO-102-2020)

Volume

11

Issue

1

Publisher

Nature Portfolio

Publisher Location

HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY

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