National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-shi, Chiba, 263-8555, Japan.
National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan.
J Environ Radioact. 2021 Oct;237:106664. doi: 10.1016/j.jenvrad.2021.106664. Epub 2021 May 31.
Ingestion of edible wild mushrooms collected in areas contaminated with radiocesium released from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident may pose a risk of internal dose to their consumers. A species-specific aggregated transfer factor (T), which is calculated using radiocesium concentration in a wild mushroom species (Bq kg wet mass [WM]) divided by the total concentration in the soil surface area (Bq m), would be a useful tool to estimate the dose from wild mushrooms by ingestion. In this study, we especially focused on the T data collected in 2016-2020 to use these values for a long-term dose assessment. We assumed that Cs concentrations after that year were almost the same, thus the soil-mushroom system would be in an apparent steady-state condition. In all, we could obtain T values of Cs in 62 edible wild mushroom species native to Japan. The geometric mean (GM) values were 1.5 × 10 m kg WM using GMs of 13 saprobic type species and 5.0 × 10 m kg WM using GMs of 21 mycorrhizal type species (N > 2). On average, the GMs of species-specific T values were 1.9 ± 0.9 times higher than those reported in a previous study of wild mushrooms made after the FDNPP accident, probably due to the different approaches for T calculation.
食用在福岛第一核电站（FDNPP）事故释放的放射性铯污染地区采集的可食用野生蘑菇可能会对消费者造成内照射剂量的风险。一种特定物种的聚集转移因子（T），它是通过野生蘑菇物种中放射性铯浓度（Bq kg 湿重 [WM]）除以土壤表面积中的总浓度（Bq m）来计算的，这将是一种有用的工具，可用于通过摄入来估计野生蘑菇的剂量。在这项研究中，我们特别关注了 2016-2020 年收集的 T 数据，以利用这些数据进行长期剂量评估。我们假设该年后的 Cs 浓度几乎相同，因此土壤-蘑菇系统将处于明显的稳定状态。总共，我们可以获得原产于日本的 62 种可食用野生蘑菇的 Cs T 值。使用 13 种腐生型物种的 GMs 和 21 种菌根型物种的 GMs（N>2）的 GMs，Cs 的 GM 值为 1.5×10 m kg WM。平均而言，特定物种 T 值的 GMs 比 FDNPP 事故后对野生蘑菇进行的先前研究报告的 GMs 高 1.9±0.9 倍，这可能是由于 T 计算方法不同。
