[17a-A304-1~7] Current status of Accelerator Mass Spectrometry in Japan and the next step

[17a-A304-4] Accelerator mass spectrometry of ⁹⁰Sr in environmental samples utilizing laser photo-detachment

〇Maki Honda^1,2, Martin Martschini², Oscar Marchhart², Peter Steier², Robin Golser², Aya Sakaguchi³ (1.JAEA, 2.Univ. of Vienna, 3.Univ. of Tsukuba)

Keywords:AMS, Sr-90, laser photo-detachment

In recent years, AMS has introduced a technique of laser photo-detachment that effectively removes isobars using an 'ion cooler' that makes use of the difference between the interaction of ions and lasers (photons). This technique has enabled highly sensitive measurement of previously unmeasurable nuclides in AMS. In addition, the developments of this measurement technique and the chemical separation technique have made it possible to measure ⁹⁰Sr (half-life 28.9 years) and ¹³⁵Cs (half-life 2.3 x 10⁶ years) with AMS. This presentation will mainly focus on developing a highly sensitive 90Sr analysis technique utilizing the laser photo-detachment method equipped in the 3MV AMS at the University of Vienna. Furthermore, the feasibility of ⁹⁰Sr AMS at facilities in Japan will be discussed.