The primary aim of this report is to provide a technical introduction to the benzene synthesis for radiocarbon dating at the Research Center for Coastal Lagoon, Shimane University. It starts from sample preparation, and how to use the vacuum glass line, the formation of CO2 from CaCO3 and NBS4990C oxialic acid standard, the formation of C2H2 from CO2 and the formation of beazene from C2H2 are given. Our results for the recoveries of CO2, C2H2 and C6H6 by 17 samples are shown. The coverage is hopefully sufficiently wide to be of interest to geologists, geochemists and archaeologists who might wish to use radiocarbon dating, though the report can not be comprehensive. The method of 14C counting by the liquid scintillation counter LKB Quantulus 1220 and calculation of 14C date will be introduced in the next report II.