[21a-E303-1~12] 2.4 Accelerator Mass Spectrometry, Accelerator Beam Analysis

[21a-E303-9] Applied research using AMS system at Yamagata University

Toru Moriya¹, Mirei Takeyama¹, Hirohisa Sakurai², Hiroko Miyahara³, Motonari Ohyama⁴, Hisako Saitoh⁵, Yasushi Okada⁶, 〇Fuyuki Tokanai^1,2 (1.YU-AMS, 2.Yamagata Univ, 3.Musashino Art Univ., 4.Tohoku Univ., 5.Chiba Univ., 6.Kibunken)

Keywords:accelerator mass spectrometry

In 2010, Yamagata University (YU) installed an accelerator mass spectrometry (AMS) system. The applied researches at YU-AMS are shown below; 1) The detailed mechanism of the weakening in solar activity is unknown, and the prediction of solar activity is ambiguous. In this study, we investigate the transitions of solar cycle length before the onset of the Spoerer Minimum.; 2) Atmospheric radiocarbon (<sup>14</sup>C) levels increased from 1955 to 1963 due to atmospheric nuclear weapon test. Since then they have been decreasing to natural <sup>14</sup>C levels. As <sup>14</sup>C accumulates in human tooth enamel while it is being formed, it can be used to estimate birth year of unidentified bodies. We have established a pretreatment method of samples using by a pulverizer.; 3) We performed the <sup>14</sup>C measurements using a <sup>14</sup>C-labeled compound of <sup>14</sup>C-glucose for pharmacological and medical applications, In this conference, the applied researches with YU-AMS are presented.