A sample preparation system for Tritium and Radiocarbon at the GXNU Laboratory
Prof. Hongtao Shen1,2, Junsen Tang1, Shulin Shi1, Li Wang, Guofeng Zhang1
1Guangxi Normal University, , China, 2Guangxi key laboratory of nuclear physics and technology, Guilin, China
A very simple system for preparing Tritium and Radiocarbon sample was established for the small accelerator mass spectrometer (GXNU-AMS) at Guangxi Normal University. This sample preparation system consists of three units: crusher unit, purification unit, and collection unit, all of the main structure is made of quartz glass. A series of 3H and 14C preparation experiments were carried out to verify the reliability of the system. The recovery rates of tritium and graphite obtained were more than 80%. The carbon and H2O content in samples were linearly fitted to the gas pressure in the measurement unit of the system. The results showed an obvious linear relationship, indicating that the reliability of the sample preparation system can meet the requirements of 3H and 14C-AMS. A batch of standard samples, Reactor graphite samples, and dead graphite samples made by this system was performed with AMS measurement. The results showed that the beam current of 1H- and 12C- for each sample was greater than 15uA and 40uA, respectively, which could meet the requirement of AMS measurement. The measurement results of blank samples indicate the stability of the sample preparation system, and the tritium and carbon pollution introduced during the sample preparation processes were less than 5×10-16 and 2 × 10-15 respectively. The results show that the simple sample preparation system established is a compact, low-pollution, and efficient system, which meets the requirements for 3H and 14C measurements.
Hongtao Shen is a professor of Nuclear Physics and Technology at Guangxi Normal University, China, a member of the International Radiocarbon Scientific Committee, and a Member of the East Asia International Accelerator Mass Spectrometry (EA-AMS) Academic Committee. Previously he was a researcher at the University of Tsukuba, Japan. His research lies in the accelerator mass spectrometry and its application research work. He has published >30 peer-reviewed papers in leading journals such as Physical Review C, Scientific Reports, NIMB, Radiocarbon. He is now in charge of the construction of Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology in Guangxi, China.