【摘要】 <正> ¹⁴C断代法是精度较高、准确度较好的放射性同位素年代法之一。目前,该法已在考古、海洋、湖泊、晚第四纪、土壤等科学研究中得到广泛应用。 本试验采用的是液体闪烁计数法,将样品碳转化成苯进行测定,样品的预处理与文献更多还原

【Abstract】 The article discusses the benzene synthesis vacuum line for radiocarbon dating. There are three major steps in the chemical conversion of the sample to benzene. They include: (1) the conversion of the sample to CO2; (2) the conversion of the CO2 to acetylene and (3) the conversion of the acetylene to benzene. The conversion of the CO2 to lithium carbide is described in detail. The highly active supported chromia-alumina catalyst (CrO3-Al2O3-SiO2 catalyst) for the synthesis of benzene from acetylene was applied.The optimized chemical output of the synthesized benzene has surpassed 95%; the total recovery of the conversion of the sample to benzene has been more then 80%.更多还原