Ahn H J, Song B C, Sohn S C, Lee M H, Song K, Jee K Y
Nuclear Chemistry Research Division, Korea Atomic Energy Research institute, 989-111 Daedeok daero, Yuseong-gu, Daejeon 305-353, Republic of Korea.
Appl Radiat Isot. 2013 Nov;81:62-6. doi: 10.1016/j.apradiso.2013.03.059. Epub 2013 Apr 10.
Wet oxidation methods are utilized to separate and quantify (3)H and (14)C radionuclides in inorganic and organic radwastes generated at nuclear facilities. Because (3)H and (14)C are pure beta emitters with half-lives of 12.3 and 5,730 years, respectively, these radionuclides should be chemically separated from other radionuclides present in radwastes for accurate quantification. In particular, a collection technique for (14)C radionuclide in radwastes is needed because it is converted into (14)CO2 gas by an oxidation reaction. To confirm the recoveries of (3)H and (14)C, various standard radioactive sources were used to verify the proposed method. Because the majority of (3)H radionuclides are distributed in tritiated water (HTO), only tritiated water was used as a standard for (3)H radionuclides. Additionally, (14)C-labeled methanol ((14)CH3OH), lauric acid ((14)CH3(CH2)10COOH), sodium bicarbonate (NaH(14)CO3), and toluene (C6H5(14)CH3) were used as (14)C standards. The compounds were oxidized with chemical oxidants and then separated. The individual species were mixed with a scintillation cocktail and counted using a liquid scintillation counter. The recoveries of (14)C and (3)H were 82-97% and 98%, respectively. The wet oxidation method will be applied to RI wastes for clearance.
湿式氧化法用于分离和定量核设施产生的无机和有机放射性废物中的³H和¹⁴C放射性核素。由于³H和¹⁴C是纯β发射体，半衰期分别为12.3年和5730年，为了准确量化，这些放射性核素应与放射性废物中存在的其他放射性核素进行化学分离。特别是，需要一种放射性废物中¹⁴C放射性核素的收集技术，因为它会通过氧化反应转化为¹⁴CO₂气体。为了确认³H和¹⁴C的回收率，使用了各种标准放射性源来验证所提出的方法。由于大部分³H放射性核素分布在氚化水中（HTO），因此仅使用氚化水作为³H放射性核素的标准。此外，¹⁴C标记的甲醇（¹⁴CH₃OH）、月桂酸（¹⁴CH₃(CH₂)₁₀COOH）、碳酸氢钠（NaH¹⁴CO₃）和甲苯（C₆H₅¹⁴CH₃）用作¹⁴C标准。这些化合物用化学氧化剂氧化，然后分离。将各个物种与闪烁鸡尾酒混合，并用液体闪烁计数器计数。¹⁴C和³H的回收率分别为82-97%和98%。湿式氧化法将应用于放射性核素废物的清除。
