|
|||||
|
|
An isotope separator for small noble gas samples |
|
| Affiliation: | 1. School of Data and Computer Science, Sun Yat-sen University, Guangzhou 510006, Guangdong, China;2. Guangdong Key Laboratory of Information Security Technology, Guangzhou, 510006, China;3. The Key Laboratory of Machine Intelligence and Advanced Computing, (Sun Yat-sen University), Ministry of Education, Guangzhou, 510006, China;1. School of Archaeological and Forensic Sciences, University of Bradford, Bradford, West Yorkshire BD7 1DP, UK;2. British Geological Survey, Keyworth, Nottingham NG12 5GG, UK;3. Archaeology Institute, University of the Highlands and Islands, Orkney College UHI, Kirkwall, Orkney KW15 1LX, UK;4. Department of Archaeology, Durham University, South Road, Durham DH1 3LE, UK |
| Abstract: | A Wien filter isotope enrichment system has been combined with a small turbomolecular pump to form a closed isotope separator for small noble gas samples. Atoms which leave the exit aperture of the plasma discharge ion source without being ionized are circulated back into the source through a feedback line. The system can be operated for several hours in a closed mode to collect up to 50% of the total number of atoms of a selected isotope (e.g. 81Kr) out of a small gas sample of only 2 × 10−3 cm3 STP. Ions are implanted at 10 kV into an aluminized Kapton foil after a flight distance of 150 cm. A beam stabilization system centers the ion beam in two perpendicular directions onto a target aperture to maintain a high enrichment factor of at least 103 over extended periods of time. Calibration of the enrichment process is achieved by isotope dilution. The system is a key part of the sample processing for 81Kr and 85Kr analysis by laser resonance ionization spectroscopy for applications in isotope geophysics. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |