Preliminary results of oxygen isotope ratio measurement with a particle-gamma coincidence method

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• 作者：Maciek Borysiuk ; ^{maciek.borysiuk@pixe.lth.se" class="auth_mail" title="E-mail the corresponding author} ; Per Kristiansson ; Linus Ros ; Nassem S. Abdel ; Mikael Elfman ; Charlotta Nilsson ; Jan Pallon
• 关键词：Nuclear reaction analysis ; Geology ; IBA ; Microbeam
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2015
• 出版时间：1 April 2015
• 年：2015
• 卷：348
• 期：Complete
• 页码：269-272
• 全文大小：1659 K

文摘

The possibility to study variations in the oxygen isotopic ratio with photon tagged nuclear reaction analysis (pNRA) is evaluated in the current work. The experiment described in the article was performed at Lund Ion Beam Analysis Facility (LIBAF) with a 2 MeV deuteron beam.

Isotopic fractionation of light elements such as carbon, oxygen and nitrogen is the basis of many analytical tools in hydrology, geology, paleobiology and paleogeology. IBA methods provide one possible tool for measurement of isotopic content. During this experimental run we focused on measurement of the oxygen isotopic ratio. The measurement of stable isotopes of oxygen has a number of applications; the particular one driving the current investigation belongs to the field of astrogeology and specifically evaluation of fossil extraterrestrial material.

There are three stable isotopes of oxygen: ¹⁶O, ¹⁷O and ¹⁸O. We procured samples highly enriched with all three isotopes. Isotopes ¹⁶O and ¹⁸O were easily detected in the enriched samples, but no significant signal from ¹⁷O was detected in the same samples. The measured yield was too low to detect ¹⁸O in a sample with natural abundances of oxygen isotopes, at least in the current experimental setup, but the spectral line from the reaction with ¹⁶O was clearly visible.