Ohta Tomoko, Fukutani Satoshi, Kubota Takumi, Mahara Yasunori
Department of Nuclear Technology, Nagaoka University of Technology, Nagaoka, Niigata, 940-2188, Japan.
Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka, 590-0494, Japan.
Anal Sci. 2024 Oct;40(10):1927-1930. doi: 10.1007/s44211-024-00615-6. Epub 2024 Jun 11.
We investigated the tritium concentration in commercial modern DO reagents frequently used in nuclear magnetic resonance analysis for analytical chemistry and in environmental tracer testing. The concentration of tritium in 11 DO and 1 HO reagents ranged from 61 Bq/L (5 × 10 TU) to 2.5 × 10 Bq/L (2 × 10 TU) in order of magnitude. The tritium concentration in the DO reagents have increased with the increasing purity of DO. The tritium concentration in all reagents was an order of magnitude greater than that in the surface waters at the Fukushima off-site of the Fukushima Daiichi Nuclear Power Plant after the accident in 2011 and in precipitation during the nuclear test era. However, the concentration of the tritium was lower than the regulatory limit for the concentration of tritium in drinking water accepted by the World Health Organization guidelines. The internal exposure effects from drinking the tritium water, which is contaminated by the tritium condensed in the reagent production processes, were negligible, even if the reagent was used in the environmental tracer test.
我们研究了常用于分析化学核磁共振分析和环境示踪剂测试的市售现代溶解氧（DO）试剂中的氚浓度。11种DO试剂和1种重水（HO）试剂中的氚浓度按数量级从61贝可勒尔/升（5×10氚单位）到2.5×10贝可勒尔/升（2×10氚单位）不等。DO试剂中的氚浓度随着DO纯度的提高而增加。所有试剂中的氚浓度比2011年事故后福岛第一核电站福岛场外地表水以及核试验时期降水中的氚浓度高一个数量级。然而，氚浓度低于世界卫生组织指南认可的饮用水中氚浓度的监管限值。即使在环境示踪剂测试中使用了该试剂，饮用因试剂生产过程中冷凝的氚而受到污染的含氚水所产生的内照射影响也可忽略不计。
