Analysis of 81Kr groundwater using laser resonance ionization spectroscopy

Kramer, S.D.; Hurst, G.S.; Chen, C.H.; Payne, M.G.; Allman, S.L.; Phillips, R.C.; Lehmann, B.E.; Oeschger, H.; Loosli, H.H.; Willis, R.D.; Thonnard, N. (1986). Analysis of 81Kr groundwater using laser resonance ionization spectroscopy. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 17(5-6), pp. 395-401. Elsevier 10.1016/0168-583X(86)90171-0

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A new analytical technique based on resonant ionization of krypton with a vacuum ultraviolet (VUV) laser source was used to determine low-level 81Kr concentrations in groundwater. The long half-life (210000 yr) and low concentration (1.3 × 10381Kr atoms per liter of modern water at 10°C) make the detection of 81Kr by radioactive counting techniques extremely difficult. In this method, krypton gas was removed from water taken from an underground Swiss aquifer using standard cryogenic and Chromatographic techniques. Stable krypton isotopes were then reduced by a factor of 107 by a two-stage isotopic enrichment cycle using a commercially available mass spectrometer. The enriched gas containing about 108 stable krypton atoms and about 103 atoms of 81Kr was implanted into a silicon disc. This disc was then placed in the high vacuum final counting chamber and the krypton was released by laser annealing. This chamber contained a quadrupole mass spectrometer which used a pulsed VUV laser source at the ionizer. The measured signal indicated that the sample contained 1200 (± 300) atoms of 81Kr.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Lehmann, Bernhard and Loosli, Heinz Hugo

Subjects:

500 Science > 530 Physics

ISSN:

0168-583X

Publisher:

Elsevier

Language:

English

Submitter:

BORIS Import 2

Date Deposited:

16 Sep 2021 14:27

Last Modified:

16 Sep 2021 14:27

Publisher DOI:

10.1016/0168-583X(86)90171-0

URI:

https://boris.unibe.ch/id/eprint/158486

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