[11a-N402-1~8] CS.1 Code-sharing Session of 2.3 & 7.5

[11a-N402-4] Comparative Study of Deposition Flux Variations by Highly Sensitive Detection of Long Half-life Radioactive Halogens ³⁶Cl and ¹²⁹I using Accelerator Mass Spectrometry

〇Kimikazu Sasa¹, Yuta Ochiai¹, Masumi Matsumura¹, Tsutomu Takahashi¹, Tetsuya Matsunaka² (1.AMS, Univ. Tsukuba, 2.LLRL, Kanazawa Univ.)

Keywords:Accelerator Mass Spectrometry, Cl-36, I-129

We evaluate the variation and behavior of the fall out amount of ³⁶Cl, which is mainly a cosmogenic nuclide, and ¹²⁹I which is one of the cross-border pollution and is mainly caused by nuclear activity, and examine its adaptability as an environmental tracer. In particular, we conducted a comparative evaluation with the Pacific side regarding the seasonal variation in the fall out amount of long half-life radioactive halogens such as ³⁶Cl and ¹²⁹I on the Sea of Japan side, where there are few studies. Precipitation ³⁶Cl and ¹²⁹I concentrations tended to increase in winter on the Sea of Japan side.