Radioactive Cesium Accumulation in Seaweeds by the Fukushima 1 Nuclear Power Plant Accident-Two Years’ Monitoring at Iwaki and Its Vicinity
Open accessAbstract
Accumulations of radionuclides in marine macroalgae (seaweeds) resulting from the Fukushima 1 Nuclear Power Plant (F1NPP) accident in March 2011 have been monitored for two years using high-purity germanium detectors. Algal specimens were collected seasonally by snorkeling at Nagasaki, Iwaki, Fukushima Prefecture (Pref.), Japan, ca. 50 km perimeter from the F1NPP. Additional collections were done at Soma, Hironocho, Hisanohama and Shioyazaki in Fukushima Pref. as well as at Chiba Pref. and Hyogo Pref. as controls. In May 2011, specimens of most macroalgal species showed ¹³⁷Cs levels greater than 3,000 Bq kg⁻¹ at Shioyazaki and Nagasaki. The highest ¹³⁷Cs level recorded 7371.20 ± 173.95 Bq kg⁻¹ in Undaria pinnatifida (Harvey) Suringar on 2 May 2011, whereas seawater collected at the same time at Shioyazaki and Nagasaki measured 8.41 ± 3.21 and 9.74 ± 3.43 Bq L⁻¹, respectively. The concentration factor of marine macroalgae was estimated to be ca. 8-50, depending on taxa and considering a weight ratio of wet/dry samples of ca. 10. ¹³⁷Cs level declined remarkably during the following 5-6 months. In contrast, the ¹³⁷Cs level remained rather stable during the following 12-16 months, and maintained the range of 10-110 Bq kg⁻¹. Contamination was still detectable in many samples in March 2013, 24 months after the most significant pollution.
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In the early stage of the Fukushima nuclear accident (May 2011), Cs content in most frozen algae samples was higher than 3000 Bq/kg, with maximum 7433.50 and 7371.20 Bq/kg, indicating nuclear pollution to algae was most serious in the early stage.
“In the early stage of the impact of nuclear leakage on algae (May 2011), the Cs and Cs content measured in most frozen algae samples were higher than 3000 Bq kg−1, with the maximum content reaching 7433.50 and 7371.20 Bq kg−1, respectively, indicating that the nuclear pollution to algae was the most serious in the early stage of radiation.”
From Current Status and Future Trends in Removal, Control, and Mitigation of Algae Food Safety Risks for Human Consumption (2022) · cites this paper as [62]
Undaria pinnatifida had the most types and highest concentration of nuclear radiation among seaweed species analyzed from Fukushima data.
“According to their idea of comparing cesium ratios of different nuclides, the data measured by Kawai et al. in 2014 [62] were conducted graphic analysis (Figure 2) and it was found that Undaria Pinnatifida had the most types and the highest concentration of nuclear radiation.”
From Current Status and Future Trends in Removal, Control, and Mitigation of Algae Food Safety Risks for Human Consumption (2022) · cites this paper as [62]
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- Authors
- Kawai, H., Kitamura, A., Mimura, M., Mimura, T., Tahara, T., Aida, D., Sato, K., & Sasaki, H.
- Affiliations
- Kobe University Research Center for Inland Seas (JP)
- Kobe University (JP)
- IRYO Sosei University (JP)
- Corresponding author
- Kawai, Hiroshi
- Venue
- Journal of Plant Research
- Published
- 2013-12-06
- Volume
- 127
- Issue
- 1
- Pages
- 23-42
- ISSN
- 0918-9440 (ISSN-L)
- 1618-0860
- PMC
- PMC3882568
- OpenAlex
- W1984920403
- Cited by
- 34
- References
- 24
- Citations by year
- 2025: 3 · 2024: 4 · 2023: 1 · 2022: 3 · 2021: 4 · 2020: 2 · 2019: 5 · 2018: 3 · 2017: 1 · 2016: 3 · 2015: 2 · 2013: 2
- FWCI
- 1.78
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Plant Research (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (25291087)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Radioactive contamination and transfer
- Physical Sciences › Environmental Science › Ecology › Marine and Coastal Ecosystems
- Health Sciences › Health Professions › Radiological and Ultrasound Technology › Radioactivity and Radon Measurements
- Keywords
- cesium-137, Fukushima Daiichi nuclear accident, seaweed, radionuclide accumulation, Undaria pinnatifida, concentration factor, Iwaki, marine radioactivity
- MeSH terms
- Cesium Radioisotopes, Geography, Japan, Radiation Monitoring, Seawater, Seaweed, Time Factors, Water Pollutants, Radioactive, Nuclear Power Plants, Fukushima Nuclear Accident
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