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- Title
Radioactive cesium accumulation in seaweeds by the Fukushima 1 Nuclear Power Plant accident-two years' monitoring at Iwaki and its vicinity.
- Authors
Kawai, Hiroshi; Kitamura, Akira; Mimura, Mari; Mimura, Tetsuro; Tahara, Tomoya; Aida, Daiki; Sato, Kenji; Sasaki, Hideaki
- Abstract
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 Cs levels greater than 3,000 Bq kg at Shioyazaki and Nagasaki. The highest Cs level recorded 7371.20 ± 173.95 Bq kg 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, 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. Cs level declined remarkably during the following 5-6 months. In contrast, the Cs level remained rather stable during the following 12-16 months, and maintained the range of 10-110 Bq kg. Contamination was still detectable in many samples in March 2013, 24 months after the most significant pollution.
- Subjects
IWAKI-shi (Japan); RADIOACTIVE substances; CESIUM; BIOACCUMULATION; NUCLEAR power plants; RADIOISOTOPES; GERMANIUM detectors
- Publication
Journal of Plant Research, 2014, Vol 127, Issue 1, p23
- ISSN
0918-9440
- Publication type
Article
- DOI
10.1007/s10265-013-0603-1