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※ 半角英数字
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Estimation of deposition velocities of HT and $$^{14}$$CO$$_{2}$$ and their fluxes from surface environment with a development of a simultaneous sampling system for the speciation of atmospheric H-3 and C-14

存在形態別大気中H-3、C-14同時捕集サンプラーの開発及びHTと$$^{14}$$CO$$_{2}$$の沈着速度とフラックス測定

天野 光; 小嵐 淳*; 駒 知孝*; 安藤 麻里子 ; 飯田 孝夫*

Amano, Hikaru; Koarashi, Jun*; Koma, T.*; Atarashi-Andoh, Mariko; Iida, Takao*

大気中に放出されるH-3とC-14に関して、フラックスと沈着速度を解析する新しい方法を開発した。最初に、大気中に放出されるH-3とC-14の存在形態を弁別できるシステムを開発した。このシステムは、トリチウムについて水蒸気状(HTO),ガス状(HT),メタン形(CH$$_{3}$$T)を、C-14について二酸化炭素状($$^{14}$$CO$$_{2}$$)とメタン状($$^{14}$$CH$$_{4}$$)を同時に弁別できる。次に、通気法チェンバーを用いたフラックスと沈着速度を測定できる手法を開発した。これらの方法を実際に適用しHTと$$^{14}$$CO$$_{2}$$につきフラックスと沈着速度を求めその有用性を確認した。

Concerning atmospherically released tritium (T) and C-14 we have developed a new method, which can analyze their fluxes and the deposition velocities. Firstly, a simultaneous sampling system for the speciation of atmospheric tritium and C-14 has been developed. This system determines varieties of chemical forms of tritium and C-14, namely tritiated water (HTO), elemental tritium gas (HT) and tritiated methane (CH$$_{3}$$T) for tritium, $$^{14}$$CO$$_{2}$$ and 14C H4 for C-14, respectively. Secondly, a new method was developed to determine HT and $$^{14}$$CO$$_{2}$$ deposition velocities. This method can determine their fluxes and the deposition velocities without any tritium and C-14 sources.

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