1. Aggregated transfer factor of 137 Cs in wild edible mushrooms collected in 2016-2020 for long-term internal dose assessment use.
- Author
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Tagami K, Yasutaka T, Takada M, and Uchida S
- Subjects
- Cesium Radioisotopes analysis, Japan, Transfer Factor, Agaricales, Fukushima Nuclear Accident, Radiation Monitoring, Soil Pollutants, Radioactive analysis
- Abstract
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
ag ), which is calculated using radiocesium concentration in a wild mushroom species (Bq kg-1 wet mass [WM]) divided by the total concentration in the soil surface area (Bq m-2 ), would be a useful tool to estimate the dose from wild mushrooms by ingestion. In this study, we especially focused on the Tag data collected in 2016-2020 to use these values for a long-term dose assessment. We assumed that137 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 Tag values of137 Cs in 62 edible wild mushroom species native to Japan. The geometric mean (GM) values were 1.5 × 10-3 m2 kg-1 WM using GMs of 13 saprobic type species and 5.0 × 10-3 m2 kg-1 WM using GMs of 21 mycorrhizal type species (N > 2). On average, the GMs of species-specific Tag 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 Tag calculation., (Copyright © 2021 Elsevier Ltd. All rights reserved.)- Published
- 2021
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