An isotope separator for small noble gas samples

Lehmann, B.E.; Rauber, D.F.; Thonnard, N.; Willis, R.D. (1987). An isotope separator for small noble gas samples. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 28(4), pp. 571-574. Elsevier 10.1016/0168-583X(87)90505-2

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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.

Item Type:	Journal Article (Original Article)
Division/Institute:	08 Faculty of Science > Physics Institute > Climate and Environmental Physics
UniBE Contributor:	Lehmann, Bernhard
Subjects:	500 Science > 530 Physics
ISSN:	0168-583X
Publisher:	Elsevier
Language:	English
Submitter:	BORIS Import 2
Date Deposited:	16 Sep 2021 14:16
Last Modified:	05 Dec 2022 15:52
Publisher DOI:	10.1016/0168-583X(87)90505-2
URI:	https://boris.unibe.ch/id/eprint/158477