报告时间：2018年8月21日（星期二）上午9：00

报告地点：能源会议中心201会议室

报告人： Mr. Marek Jirus, Palacky University in Olomouc, Czech Republic

　　报告摘要：

　　In this work several proposed heat resistant materials were studied for the development of slit windows for reaction chambers in M?ssbauer spectroscopy (MS). The material separating the sample section from the source and detector sections is required to have low absorption coefficient. Therefore their gamma-absorption properties were studied by MCA measurements using a common M?ssbauer source of gamma radiation (57Co). Standard M?ssbauer measurements were performed to determine any MS active contaminants presence that might influence the final spectra. High temperature annealing in air atmosphere of 1 bar pressure was carried out in for determining if the materials undergo any form of thermal decomposition or transformation. Such annealed samples were then studied with MS to establish thermal stability of their chemical composition. Effects of prolong and repeated exposure to these conditions were discussed in detail. Based on the observations, reusability and application potential of aforementioned materials are determined. The influence of modified measurement geometry on transmission M?sbauer spectrometer was established. In the end of this work a finished model of a MS microreactor is presented together with a visualisation of its possible mounting in M?sbauer laboratory in DICP.

　　报告联系人：DNL2005 周雯慧

　　联系电话：84379711