- Conference date: 8-12 October 2000
- Location: Knoxville, Tennessee (USA)
Radon-220 and Radon-222 in environmental air samples can be measured on-line with high temporal resolution by state-of-the-art alpha counting. Argon-37, Krypton-85 and Argon-39 are measured routinely by low level decay counting using high-pressure gas proportional counters in an underground laboratory. For Krypton-81 decay counting is not possible in environmental samples. Therefore, various attempts have been made to use atom counting techniques for this isotope. Laser Resonance Ionization Spectroscopy was used to count Kr-81 atoms from old groundwater samples. In a more recent study groundwater dating in the Great Artesian Basin in Australia was accomplished using Cyclotron Accelerator Mass Spectroscopy. Collinear Beam Spectroscopy using Photon Burst Detection and Atom Trap Trace Analysis were successfully used to detect both Kr-81 and Kr-85 in natural Kr samples. Most of these new techniques, however, need to be further improved to become routine tools in environmental studies. © 2001 American Institute of Physics.
- Atomic and molecular beams
- Cyclotron resonances
- High pressure
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