Lam Siok Ee, Mat Nawi Siti Nurasiah, Abdul Sani Siti Fairus, Khandaker Mayeen Uddin, Bradley David Andrew
Research Centre for Applied Physics and Radiation Technologies, School of Engineering and Technology, Sunway University, 47500, Bandar Sunway, Selangor, Malaysia.
Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Sci Rep. 2021 Apr 12;11(1):7939. doi: 10.1038/s41598-021-86942-4.
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 [Formula: see text]Co 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 [Formula: see text] and 1589 [Formula: see text] respectively, the intensity ratio [Formula: see text] 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 [Formula: see text] nm and [Formula: see text] nm, respectively. The hair samples mean band gap energy ([Formula: see text]) post-irradiation was found to be [Formula: see text] eV, of the order of a semiconductor and approximately two times the [Formula: see text] of other carbon-rich materials reported via the same methodology.
已对黑色人发进行了初步研究，其碳浓度约为53%，是一种用于检验人头发在回顾性和应急生物剂量测定应用中的潜力的模型，其有效原子序数也接近水的原子序数。将头发样本暴露于[公式：见正文]钴伽马射线下，剂量范围为0至200戈瑞。利用拉曼光谱和光致发光（PL）光谱观察结构变化。在一阶拉曼光谱中观察到的最显著特征是D峰和G峰，分别出现在1370[公式：见正文]和1589[公式：见正文]处，强度比[公式：见正文]表明结构变化的剂量依赖性缺陷产生和退火。发现PL吸收峰和发射峰的波长分别以[公式：见正文]纳米和[公式：见正文]纳米为中心。辐照后头发样本的平均带隙能量（[公式：见正文]）为[公式：见正文]电子伏特，属于半导体范围，约为通过相同方法报道的其他富碳材料的[公式：见正文]的两倍。
