Development of laser-based resonance ionization techniques for 81-Kr and 85-Kr measurements in the geosciences, II. December 1, 1994 through December 31, 2000 reporting period. Final technical report for Grant No. DE-FG05-95ER14497

Thonnard, Norbert ; McKay, Larry D. ; Labotka, Theodore C.

Institute for Rare Isotope Measurements and Departments of Geological Sciences and Physics & Astronomy, The University of Tennessee, Knoxville, TN (United States)

关键词: Reservoir Rock Krypton 81;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Resonance Ionization Mass Spectroscopy;    Ground Water;    Krypton 85;   

DOI  :  10.2172/809813
RP-ID  :  NONE
RP-ID  :  FG02-95ER14497
RP-ID  :  809813

美国|英语

来源: UNT Digital Library

【 摘 要 】

A facility for measurement of rare Kr-81 and Kr-85 isotope concentration in hydrogeologic samples, and isotopic composition of minute quantities of krypton and xenon from extraterrestrial samples, was established, requiring refinement of an emerging mass spectrometric-based analytical technique and securing of laboratory space and equipment. The analytical process consists of (1) collecting a groundwater sample, (2) degassing the water, (3) separating Kr from the recovered gases, (4&5) two isotopic enrichments to reduce interfering isotopes by E9, and (6) detecting the rare krypton isotope in a unique time-of-flight mass spectrometer detecting as few as 100 Kr atoms. All equipment is installed and operating, with only some additional adjustment and testing of the last step (6, above) remaining to be completed. Collaborations have been established with a number of researchers and organizations world wide, and both groundwater and extraterrestrial samples have been collected. Completion of analyses awaits full operation of step 6.