Measurement technique for tritium in the atmospheric environment

Naofumi Akata; Masahiro Tanaka; Shigekazu Hirao; Toshiya Tamari; Hideki Kakiuchi; Shinji Sugihara; Haruka Kuwata; Hirofumi Tazoe

Presentation information

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-AG Applied Geosciences

[M-AG39] Radioisotope migration: New development for dynamics study of radionuclides from 1F NPP accident

Mon. May 23, 2022 1:45 PM - 3:15 PM 202 (International Conference Hall, Makuhari Messe)

convener:Daisuke Tsumune(Central Research Institute of Electric Power Industry), convener:Yuichi Onda(Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba), Yoshio Takahashi(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), convener:Akira Kirishima(Tohoku University), Chairperson:Daisuke Tsumune(Central Research Institute of Electric Power Industry), Akira Kirishima(Tohoku University)

1:45 PM - 2:00 PM

[MAG39-01] Measurement technique for tritium in the atmospheric environment

★Invited Papers

*Naofumi Akata¹, Masahiro Tanaka², Shigekazu Hirao³, Toshiya Tamari⁴, Hideki Kakiuchi⁵, Shinji Sugihara⁶, Haruka Kuwata¹, Hirofumi Tazoe¹ (1.Hirosaki University, 2.National Instutute for Fusion Science, 3.Fukushima University, 4.Kyushu Environmental Evaluation Association, 5.Institute for Environmental Sciences, 6.Kyushu University)

Keywords:tritium, atmospheric environment

Tritium (³H; T_1/2 = 12.3 y) is the radioisotope of hydrogen and it decays to ³He; the main sources of environmental tritium are natural, although there are some artificial sources. The 99% of environmental tritium exists in water vapor, rainwater, landwater and seawater as a chemical form of HTO , and moves on the earth surface according to water cycle. It is common to use a low background liquid scintillation counter for tritium measurement in general environment. On the other hand, atmospheric tritium have three chemical form which are water vapor (HTO), hydrogen (HT) and hydrocarbons (mainly CH₃T), they are separately collected as water after oxidation for measurement.
This presentation reports the measurement technique for tritium in the atmospheric environment.