WordNet

a colorless element that is one of the six inert gasses; occurs in trace amounts in air (同)Kr, atomic number 36
a radioactive isotope of an element; produced either naturally or artificially

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Aeschbach-Hertig W1.
Proceedings of the National Academy of Sciences of the United States of America.Proc Natl Acad Sci U S A.2014 May 13;111(19):6856-7. doi: 10.1073/pnas.1405830111. Epub 2014 Apr 30.
PMID 24785295

Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica.

Buizert C1, Baggenstos D2, Jiang W3, Purtschert R4, Petrenko VV5, Lu ZT6, Müller P3, Kuhl T7, Lee J8, Severinghaus JP2, Brook EJ8.
Proceedings of the National Academy of Sciences of the United States of America.Proc Natl Acad Sci U S A.2014 May 13;111(19):6876-81. doi: 10.1073/pnas.1320329111. Epub 2014 Apr 21.
We present successful (81)Kr-Kr radiometric dating of ancient polar ice. Krypton was extracted from the air bubbles in four ∼350-kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The (81)Kr radiometric ages agree with
PMID 24753606

Krypton-81 in groundwater of the Culebra Dolomite near the Waste Isolation Pilot Plant, New Mexico.

Sturchio NC1, Kuhlman KL2, Yokochi R3, Probst PC4, Jiang W5, Lu ZT6, Mueller P5, Yang GM7.
Journal of contaminant hydrology.J Contam Hydrol.2014 May;160:12-20. doi: 10.1016/j.jconhyd.2014.02.002. Epub 2014 Feb 16.
The Waste Isolation Pilot Plant (WIPP) in New Mexico is the first geologic repository for disposal of transuranic nuclear waste from defense-related programs of the US Department of Energy. It is constructed within halite beds of the Permian-age Salado Formation. The Culebra Dolomite, confined withi
PMID 24594409

Separation of dissolved Kr from a water sample by means of a hollow fiber membrane

Ohta Tomoko,Mahara Yasunori,Momoshima N,Inoue F.,Shimada J.,Ikawa R.,Taniguchi M.
Journal of Hydrology 376(1-2), 152-158, 2009-09
… We investigated extraction of the krypton (Kr) radioisotope 85Kr from groundwater having an ultra-low concentration with a Kr extraction system using an external inflow type hollow fiber membrane. …
NAID 120001657620