[16p-D519-1~15] CS.1 Code-sharing Session of 2.3 & 7.4 &7.5

[16p-D519-6] Trial Experiments of Ultra-high Sensitivity Detection for Long-half-life Radioactive Cesium-135 by Accelerator Mass Spectrometry

〇Kimikazu Sasa^1,2, Daisuke Shiine², Tsutomu Takahashi¹, Masumi Matsumura¹, Aya Sakaguchi² (1.UTTAC, Univ. Tsukuba, 2.Pure Appl. Sci., Univ. Tsukuba)

Keywords:Accelerator Mass Spectrometry, Cesium-135, Rb sputtering negative ion source

Development of a highly sensitive detection method for a long half-life radioactive ¹³⁵Cs (T_1/2 = 2.3 million years) is required as one of the anthropogenic nuclides in the nuclear age. In this study, ¹³³Cs¹⁹F₂^- beam of 0.2 μA was obtained from the cathode sample of Cs₂SO₄ mixed with PbF₂ sputtering by Rb. CsF₂^- was accelerated at the terminal voltage of 5 MV, and passed through an Ar gas stripper. Cs⁹⁺ (58.7 MeV) and isobars were analyzed by the rare particle detection line with a mass number of 135.