Fukushima Prefectural Centre for Environmental Creation, 10-2 Fukasaku, Miharu-machi, Fukushima, 963-7700, Japan.
Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima-shi, Fukushima, 960-1296, Japan.
Sci Rep. 2020 Apr 22;10(1):6796. doi: 10.1038/s41598-020-63507-5.
After the accident at the TEPCO Fukushima Daiichi Nuclear Power Plant in 2011, it became important to study radiation dynamics, assess internal radiation exposure and specify factors affecting radionuclide variation in wildlife. Therefore, it is necessary to investigate which physicochemical fractions of radiocaesium (Cs) are absorbed from ingested material in species with high activity concentrations of Cs, such as wild boar. This study analysed the physicochemical fractions of Cs in the stomach contents of wild boar to evaluate the transfer from ingested food to muscle. The Cs activity concentration in muscle showed a significantly positive relationship with the Cs activity concentration in the exchangeable fraction, and the sum of the Cs activity concentrations in the exchangeable and bound to organic matter fractions. Seasonal variations were also found in the Cs activity concentration in the exchangeable fraction, and the sum of the Cs activity concentrations in the exchangeable and bound to organic matter fractions. These findings suggest that the proportions of the physicochemical fractions of Cs in the exchangeable and bound to organic matter fractions in the stomach contents are important factors affecting the increases and seasonal dynamics of the activity concentrations of Cs in wild boar muscle.
2011 年东京电力福岛第一核电站事故发生后，研究辐射动态、评估内部辐射暴露情况以及确定影响野生动物放射性核素变化的因素变得尤为重要。因此，有必要调查在像野猪这样的 Cs 高活度物种中，从摄入物质中吸收的放射性铯（Cs）的哪些物理化学形态。本研究分析了野猪胃内容物中 Cs 的物理化学形态，以评估从摄入食物向肌肉的转移。肌肉中 Cs 的活度浓度与可交换态的 Cs 活度浓度以及可交换态和结合有机物质态的 Cs 活度浓度之和呈显著正相关。还发现可交换态的 Cs 活度浓度以及可交换态和结合有机物质态的 Cs 活度浓度之和存在季节性变化。这些发现表明，胃内容物中可交换态和结合有机物质态的 Cs 物理化学形态的比例是影响野猪肌肉中 Cs 活度浓度增加和季节性动态的重要因素。
