Browsing by Author "Sezgin, Nursel"

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Investigation of Human Hair by Laser-Induced Breakdown Spectroscopy: Qualitative and Quantitative Analysis of Content Element in Human Hair
(Wiley, 2025) Arbi, Ines; Yumun, Gunduz; Sezgin, Nursel
Human hair is a significant biological sample in forensic science, biomedical research, and the cosmetic industry, with the presence of essential nutrients like zinc, copper, and silicon being indicative of health. This study aimed to investigate the elemental composition of human hair using Laser-Induced Breakdown Spectroscopy (LIBS) to assess differences across age groups. Nine volunteers provided hair samples, which were analyzed using the Foster + Freeman ECCO2 LIBS system. Quantitative analysis of elemental concentrations was performed, and elemental ratios, such as Mg/Ca, Mg/Si, Mg/Fe, and Fe/Mn, were calculated to compare the samples. Results demonstrated that LIBS is a fast, accurate, and non-destructive method for detecting and quantifying mineral elements in human hair. The study highlights age-related differences in elemental concentrations, offering insights into the use of hair analysis for monitoring nutritional and health status. LIBS could be a promising tool for further studies in clinical and forensic applications.
Shielding Effect of Aluminum Against Cs-137 Source, According To Gamma Ray Transmission Technique
(2022) Şengül, Müge; Aras, Berna; Sezgin, Nursel; Turgay, Muttalip Ergun
In this study the shielding effect of the Aluminum element against radiation is referred to by using the gamma ray transmission technique. Selected gamma-ray source Cesium is monoenergytic and not necessary the activity correction due to its half-life. Absorption caused by aluminum leads to a reduction in the radiation dose exposed. In the literature, there are many studies on this technique using different materials. Our experiments were carried out with aluminum samples of different thicknesses. Density values are calculated through counts obtained using the Scintillation detector is used in order to get intensity values via counts. By increasing the thickness of the sample from a minimum of 0.49 cm to a maximum of 2.29 cm, the [I/Io] ratio is respectively; 0.8995; 0.8134; 0.7170 and 0.6413 calculated. The curve of variation of the ratio [I/Io] for different thicknesses is given in the graph. R2 value was obtained as 0.9960. The linear absorption effect is accurately observed. Another issue is; in industrial applications, using these intensity ratios; material thickness measurements can be made easily.