Australian Facility For Noble-Gas Radio Isotope Measurements Using Atom Trap Trace Analysis
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1 Australian Facility For Noble-Gas Radio Isotope Measurements Using Atom Trap Trace Analysis Philip S. Light, Robert Sang, Axel Suckow, Pere Masque, Dioni Cendon, Bear McPhail, Mike Hotchkis, Stephen Eggins and Andre N. Luiten This facility is supported under Australian Research Council's Linkage Infrastructure, Equipment and Facilities scheme (project LE ) 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
2 Australian Facility For Noble-Gas Radio Isotope Measurements A new facility for fast and accurate measurements of noble gas radio-nuclide ratios 81 Kr/Kr, 85 Kr/Kr, 39 Ar/Ar 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
3 Noble Gas Radio-Isotope Tracers Environmental markers to study ground and ocean water movement 4 He (estimates) T/ 3 He ratio 40 Ar CFC/SF 6 85 Kr τ 1/2 = 10.8 years 39 Ar τ 1/2 = 269 years 81 Kr τ 1/2 = 229,000 years D, 18 O 14 C τ 1/2 = 5730 years 36 Cl Groundwater Age / Years 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
4 Noble Gas Radio-Isotope Tracers Application to water dating: 39 Ar, 81 Kr, 85 Kr are cosmogenic nuclides Nearly ideal physical & chemical characteristics (e.g. unreactive) Well defined input function at water/atmosphere interface 85 Kr atmospheric concentration is primarily due Picture credit: Axel Suckow, CSIRO to nuclear fuel reprocessing 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
5 Noble Gas Radio-Isotope Tracers Application to water dating: 39 Ar, 81 Kr, 85 Kr are cosmogenic nuclides Nearly ideal physical & chemical characteristics (e.g. unreactive) Well defined input function at water/atmosphere interface 85 Kr atmospheric concentration is primarily due Picture credit: Axel Suckow, CSIRO to nuclear fuel reprocessing 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
6 Noble Gas Radio-Isotope Tracers Application to water dating: 39 Ar, 81 Kr, 85 Kr are cosmogenic nuclides Nearly ideal physical & chemical characteristics (e.g. unreactive) Well defined input function at water/atmosphere interface Rarely used due measurement difficulty 85 Kr atmospheric concentration is primarily due Picture credit: Axel Suckow, CSIRO to nuclear fuel reprocessing 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
7 Noble Gas Radio-Isotope Tracers Environmental markers to study ground and ocean water movement T/ 3 He ratio 4 He (estimates) 40 Ar Noble-gas mass spectrometry Gas chromatography CFC/SF 6 Radiometry 85 Kr τ 1/2 = 10.8 years 39 Ar τ 1/2 = 269 years 81 Kr τ 1/2 = 229,000 years Accelerator mass spectrometry D, 18 O 14 C τ 1/2 = 5730 years 36 Cl Atom trap trace analysis Groundwater Age / Years 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
8 Radio-Isotope Measurements Measurements difficult due to small atmospheric abundance: 85 Kr/Kr: 2x Kr/Kr: 5.2x Ar/Ar: 8x L of surface water contains just ~ Ar atoms & ~ Kr atoms Need to measure ratio to ~1% of atmospheric abundance in water dating applications Low-level decay counting (LLC) is traditional measurement technique Large water samples required ( litres for 39 Ar) Long measurement times (8-60 days for 39 Ar) Performed where a low background count is present e.g. University of Bern, 35m below ground 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
9 Atom Trap Trace Analysis (ATTA) Laser-based technique for measuring noble-gas radio-isotope ratios Atom-counting rather than decay-counting smaller samples, faster measurement Lasers used to cool specific isotope and hold in a magneto-optical trap Shifts in energy levels between isotopes permit selection of a single isotope by tuning laser frequencies Rohan Glover, PhD Thesis, Griffith University 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
10 Atom Trap Trace Analysis Based on established laser cooling and magneto-optical trapping Yang, G.M. et al. Analysis of 85Kr: a comparison at the level using micro-liter samples. Sci. Rep. 3, 1596; DOI: /srep01596 (2013). 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
11 Atom Trap Trace Analysis Current ATTA systems worldwide: Argonne National Laboratory, IL, USA Predominantly focussed on Kr measurements Only facility currently open for general samples Throughput ~100 samples / year University of Heidelberg, Germany Initial 39 Ar measurements demonstrated University of Science and Technology of China, Hefei, China Developing Kr capability 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
12 Performance Initial facility will offer ATTA measurements with performance comparable to existing labs Upgraded facility will offer reduced sample size and measurement time 39 Ar 81 Kr Total ml-stp Water / L Time µl-stp Water / L Time Samples / yr AMS hours LLC ~700 ~ days ATTA Facility - initial ATTA Facility - upgraded 1 5 ~12 hours ~12 hours ~5 hours ~5 hours th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
13 Sample Preparation ATTA measurement requires small gas-phase noble-gas sample Mixed noble-gas samples are not a problem due to selectivity of atom-trapping CSIRO s Environmental Tracer and Noble Gas Laboratory in Adelaide can Extract noble gases from water samples Extract gas from water in the field, and separate out noble-gas components Picture credit: Arne Kersting, Axel Suckow, CSIRO 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
14 Timeline Construction commenced at University of Adelaide and Griffith University Q Q Initial uncalibrated measurements available in Adelaide Fully calibrated measurements agreement with low-level counting Q Q Laser excitation upgrade installation smaller sample size Fully calibrated measurements increased sample throughput Q th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
15 Australian Facility For Noble-Gas Radio Isotope Measurements Fast, accurate measurements of 81 Kr, 85 Kr and 39 Ar radio-nuclide ratios Small sample size requirements (isotope dependent) Expected to commence sample measurement late 2017 Funded through per-sample analysis fee This facility is supported under Australian Research Council's Linkage Infrastructure, Equipment and Facilities scheme (project LE ) 16th September 2016 AUSTRALIAN FACILITY FOR NOBLE-GAS RADIO ISOTOPE MEASUREMENTS INPC
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