Makale

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Browsing Makale by Publisher "Elsevier Ltd."

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    The use of human hair as biodosimeter
    (Elsevier Ltd., 2014-12) Tepe Çam, Semra; Polat, Mustafa; Seyhan, Nesrin; TAEK-SANAEM
    Purpose: To investigate the potential use of human hair samples as biologic dosimeter by electron spin resonance (ESR) spectroscopy. Subjects and methods: The hair samples were obtained from female volunteers and classified according to the colour, age and whether they are natural or dyed. Natural black, brown, red, blonde and dyed black hair samples were irradiated at low dose (5-50 Gy) and at high doses (75-750 Gy) by gamma source giving the dose rate of 0.25 Gy/s in The Sarayköy Establishment of Turkish Atomic Energy Authority. Results: While the peak heights and g-values (2.0021 -2.0023) determined from recorded spectra of hair were color dependent , the peak-to-peak line widths were varied according to natural or dyed hair (ΔHpp: 0.522- 0.744 mT).In all samples, the linear dose-response curves at low doses was going to saturate after ~ 300 Gy. In black hair samples taken from different individuals, the differences in the structure of the spectrum and signal intensities were not observed. The ESR signal intensities of samples stored at room temperature for 22 days fell to their half values in 44 hour in black hair, 41 hours in blonde and brown hairs, 35 hours in dyed black hair and in 17 hour in red hair. The activation energies of samples annealed at high temperatures for different period of time were correlated well with those obtained in the literature. Conclusions: The conditions in which hair samples can be used as a biological dosimeter were found. The dose