[20a-A310-1~10] CS.1 Code-sharing Session of 2.3 & 7.4

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[20a-A310-3] Research of annual variations of ¹⁴C concentrations in pinus pumila V

〇Mirei Takeyama^1,2, Toru Moriya^1,2, Hirohisa Sakurai², Hiroko Miyahara³, Fuyuki Tokanai^1,2 (1.Yamagata Univ. Center for AMS, 2.Yamagata Univ., 3.Musashino Art Univ.)

Keywords:

accelerator mass spectrometry,carbon-14

By measuring the ¹⁴C concentration of old tree rings with high accuracy, the past solar activity and cosmic ray increase phenomenon have been investigated. Since the ¹⁴C concentration increased in the atmospheric nuclear test is returning to the pre-experimental concentration, the ¹⁴C concentration in the ecosystem due to solar activity and cosmic ray increase phenomenon is analyzed by analyzing the ¹⁴C concentration in modern annual plants with high accuracy. Real-time measurement of concentration dependence is expected. In this presentation, we report the annual variation of ¹⁴C concentration in pinus pumila using a high sensitivity accelerator mass spectrometer at Yamagata University.