Post-accident sporadic releases of airborne radionuclides from the ...
Supporting Information Environmental Science & Technology
Post‐accident sporadic releases of airborne radionuclides from the Fukushima Daiichi nuclear power plant site
Georg Steinhauser,1,5,7 Tamon Niisoe,2 Kouji H. Harada,3 Katsumi Shozugawa,4 Stephanie Schneider,5 Hans‐Arno Synal,6 Clemens Walther,5 Marcus Christl,6 Kenji Nanba,7 Hirohiko Ishikawa,8 Akio Koizumi3,*
1
Colorado State University, Environmental and Radiological Health Sciences, Fort Collins, CO 80523, United States
2
Research Division of Atmospheric and Hydrospheric Disasters, Disaster Prevention Research Institute, Kyoto University, Uji 6110011, Japan
3
Department of Health and Environmental Sciences, Kyoto University Graduate School of Medicine, Kyoto 6068501, Japan
4
Graduate School of Arts and Sciences, The University of Tokyo, Meguro‐ku, Tokyo 153‐8902, Japan
5
Leibniz Universität Hannover, Institut für Radioökologie und Strahlenschutz, D‐30419 Hannover, Germany
6
Laboratory of Ion Beam Physics, ETH Zürich, CH‐8093 Zürich, Switzerland
7
Institute of Environmental Radioactivity, Fukushima University, Fukushima 960‐1296, Japan
8
Disaster Prevention Research Institute, Kyoto University, Uji 6110011, Japan
*
To whom correspondence should be addressed. E‐mail: koizumi.akio.5v@kyoto‐u.ac.jp.
7 pages 4 figures 3 tables (see attached excel file for Tables S1 and S3)
S1
Figure S1. Location of Minamisoma City and the sampling locations in the area.
S2
Figure S2. Cesium‐137 deposition (to 15 cm depth) at the sampling sites around Minamisoma.
S3
134
137
Figure S3a. Depth profile of the Cs/ Cs activity ratios in the soil drill cores. The Reference corresponds to the “integral” signature of the Fukushima accident of 0.98 at the time of the accident (1), decay corrected to the time of sampling (September 7, 2014).
S4
134
137
Figure S3b. Depth profile of the Cs/ Cs activity ratios in the soil drill cores. The Reference corresponds to the “integral” signature of the Fukushima accident of 0.98 at the time of the accident (1), decay corrected to the time of sampling (September 7, 2014).
S5
Table S2. Radiocesium ratio in whole air borne sporadic releases in different sites and sampling times. Sampling site
Sampling datea
Volume
Radioactivity per sample
(m3)
(mBq)b
134
137
Cs
Ratio
134
Cs
Cs/137Cs
Namie
37°33'38" N 140°45'39" E
2011/7/7
84
5.58±0.06
15.80±0.09
0.353±0.004
Katsurao
37°31'33" N 140°48'21" E
2011/7/7
84
2.09±0.07
6.68±0.09
0.313±0.011
Minamisoma
37°38'37" N 140°55'27" E
2013/8/15‐2013/8/22
1181
29.82±0.19
79.60±0.26
0.375±0.003
a
Samples were collected indicated dates and re‐analyzed in May, 2015. Samples in 2011 were identical to those reported by Koizumi et al. (2).
b
Radioactivity is shown with a counting error and decay‐adjusted to September 7, 2014.
S6
Figure S4. Isotopic ratios of
240
239
Pu/
Pu in soil samples in the Minamisoma area.
References 1.
Merz S, Steinhauser G, & Hamada N (2013) Anthropogenic radionuclides in Japanese food: environmental and legal implications. Environ Sci Technol 47(3):1248‐1256.
2.
Koizumi A, et al. (2012) Preliminary assessment of ecological exposure of adult residents in Fukushima Prefecture to radioactive cesium through ingestion and inhalation. Environ Health Prev Med 17(4):292‐298.
S7
Post‐accident sporadic releases of airborne radionuclides from the Fukushima Daiichi nuclear power plant site
Georg Steinhauser,1,5,7 Tamon Niisoe,2 Kouji H. Harada,3 Katsumi Shozugawa,4 Stephanie Schneider,5 Hans‐Arno Synal,6 Clemens Walther,5 Marcus Christl,6 Kenji Nanba,7 Hirohiko Ishikawa,8 Akio Koizumi3,*
1
Colorado State University, Environmental and Radiological Health Sciences, Fort Collins, CO 80523, United States
2
Research Division of Atmospheric and Hydrospheric Disasters, Disaster Prevention Research Institute, Kyoto University, Uji 6110011, Japan
3
Department of Health and Environmental Sciences, Kyoto University Graduate School of Medicine, Kyoto 6068501, Japan
4
Graduate School of Arts and Sciences, The University of Tokyo, Meguro‐ku, Tokyo 153‐8902, Japan
5
Leibniz Universität Hannover, Institut für Radioökologie und Strahlenschutz, D‐30419 Hannover, Germany
6
Laboratory of Ion Beam Physics, ETH Zürich, CH‐8093 Zürich, Switzerland
7
Institute of Environmental Radioactivity, Fukushima University, Fukushima 960‐1296, Japan
8
Disaster Prevention Research Institute, Kyoto University, Uji 6110011, Japan
*
To whom correspondence should be addressed. E‐mail: koizumi.akio.5v@kyoto‐u.ac.jp.
7 pages 4 figures 3 tables (see attached excel file for Tables S1 and S3)
S1
Figure S1. Location of Minamisoma City and the sampling locations in the area.
S2
Figure S2. Cesium‐137 deposition (to 15 cm depth) at the sampling sites around Minamisoma.
S3
134
137
Figure S3a. Depth profile of the Cs/ Cs activity ratios in the soil drill cores. The Reference corresponds to the “integral” signature of the Fukushima accident of 0.98 at the time of the accident (1), decay corrected to the time of sampling (September 7, 2014).
S4
134
137
Figure S3b. Depth profile of the Cs/ Cs activity ratios in the soil drill cores. The Reference corresponds to the “integral” signature of the Fukushima accident of 0.98 at the time of the accident (1), decay corrected to the time of sampling (September 7, 2014).
S5
Table S2. Radiocesium ratio in whole air borne sporadic releases in different sites and sampling times. Sampling site
Sampling datea
Volume
Radioactivity per sample
(m3)
(mBq)b
134
137
Cs
Ratio
134
Cs
Cs/137Cs
Namie
37°33'38" N 140°45'39" E
2011/7/7
84
5.58±0.06
15.80±0.09
0.353±0.004
Katsurao
37°31'33" N 140°48'21" E
2011/7/7
84
2.09±0.07
6.68±0.09
0.313±0.011
Minamisoma
37°38'37" N 140°55'27" E
2013/8/15‐2013/8/22
1181
29.82±0.19
79.60±0.26
0.375±0.003
a
Samples were collected indicated dates and re‐analyzed in May, 2015. Samples in 2011 were identical to those reported by Koizumi et al. (2).
b
Radioactivity is shown with a counting error and decay‐adjusted to September 7, 2014.
S6
Figure S4. Isotopic ratios of
240
239
Pu/
Pu in soil samples in the Minamisoma area.
References 1.
Merz S, Steinhauser G, & Hamada N (2013) Anthropogenic radionuclides in Japanese food: environmental and legal implications. Environ Sci Technol 47(3):1248‐1256.
2.
Koizumi A, et al. (2012) Preliminary assessment of ecological exposure of adult residents in Fukushima Prefecture to radioactive cesium through ingestion and inhalation. Environ Health Prev Med 17(4):292‐298.
S7
