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Report No.

Frontiers of studies utilizing accelerator mass spectrometry in geoscience

Honda, Maki   

The development of measurement and chemical separation techniques in the accelerator mass spectrometry (AMS) method has enabled highly sensitive analysis of $$^{244}$$Pu (half-life 8.1$$times$$10$$^{7}$$ years), $$^{60}$$Fe (half-life 2.62$$times$$10$$^{6}$$ years), and $$^{90}$$Sr (half-life 28.9 years) in AMS. For example, the study analyzing $$^{244}$$Pu in ferromanganese crust samples successfully quantified $$^{244}$$Pu from outside the solar system, which had been hidden by $$^{244}$$Pu from nuclear tests. Furthermore, the research has revealed that $$^{244}$$Pu is produced in neutron star mergers, etc., leading to unraveling the production sites where the heavy elements originate. This topic highlights the frontline of studies on $$^{244}$$Pu, $$^{60}$$Fe, and $$^{90}$$Sr utilizing AMS.



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