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Distribution of local 137Cs anomalies on the seafloor near the Fukushima Dai-ichi Nuclear Power Plant

Distribution of local 137Cs anomalies on the seafloor near the Fukushima Dai-ichi Nuclear Power Plant
Distribution of local 137Cs anomalies on the seafloor near the Fukushima Dai-ichi Nuclear Power Plant
An estimated 3.5 ± 0.7 × 1015 Bq of 137Cs is thought to have been discharged into the ocean following the melt down at Fukushima Dai-ichi Nuclear Power Plant (F1NPP). While efforts have been made to monitor seafloor radiation levels, the sampling techniques used cannot capture the continuous distribution of radionuclides. In this work, we apply in situ measurement techniques using a towed gamma ray spectrometer to map the continuous distribution of 137Cs on the seafloor within 20 km of the F1NPP. The results reveal the existence of local 137Cs anomalies, with levels of 137Cs an order of magnitude higher than the surrounding seafloors. The sizes of the anomalies mapped in this work range from a few meters to a few hundreds of meters in length, and it is demonstrated that the distribution of these anomalies is strongly influenced by meter scale features of the terrain.
0025-326X
344-350
Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Ohnishi, Seiki
035c497a-ec02-4ce9-9879-a39a916b5d9a
Ura, Tamaki
b8fea5ba-e731-40fd-8544-1db1ca9f356b
Odano, Naoteru
acead221-760b-421e-8c06-9907c2542f9e
Sasaki, Shun
f34a380b-54b0-4834-88ab-81d01e329739
Fujita, Tsuneo
363e3b8e-6936-4348-9cc2-0bf9043176e6
Watanabe, Tomowo
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Nakata, Kaoru
6063b36e-d1a2-4f7a-91cf-74f4728a865f
Ono, Tsuneo
53336ea6-846b-46b8-ad0e-6024aef85445
Ambe, Daisuke
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Thornton, Blair
8293beb5-c083-47e3-b5f0-d9c3cee14be9
Ohnishi, Seiki
035c497a-ec02-4ce9-9879-a39a916b5d9a
Ura, Tamaki
b8fea5ba-e731-40fd-8544-1db1ca9f356b
Odano, Naoteru
acead221-760b-421e-8c06-9907c2542f9e
Sasaki, Shun
f34a380b-54b0-4834-88ab-81d01e329739
Fujita, Tsuneo
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Watanabe, Tomowo
e32c2fef-0567-41f4-8f3c-983f45329770
Nakata, Kaoru
6063b36e-d1a2-4f7a-91cf-74f4728a865f
Ono, Tsuneo
53336ea6-846b-46b8-ad0e-6024aef85445
Ambe, Daisuke
a78bcc1d-f0aa-42b9-b385-00c7268194a1

Thornton, Blair, Ohnishi, Seiki, Ura, Tamaki, Odano, Naoteru, Sasaki, Shun, Fujita, Tsuneo, Watanabe, Tomowo, Nakata, Kaoru, Ono, Tsuneo and Ambe, Daisuke (2013) Distribution of local 137Cs anomalies on the seafloor near the Fukushima Dai-ichi Nuclear Power Plant. Marine Pollution Bulletin, 74 (1), 344-350. (doi:10.1016/j.marpolbul.2013.06.031).

Record type: Article

Abstract

An estimated 3.5 ± 0.7 × 1015 Bq of 137Cs is thought to have been discharged into the ocean following the melt down at Fukushima Dai-ichi Nuclear Power Plant (F1NPP). While efforts have been made to monitor seafloor radiation levels, the sampling techniques used cannot capture the continuous distribution of radionuclides. In this work, we apply in situ measurement techniques using a towed gamma ray spectrometer to map the continuous distribution of 137Cs on the seafloor within 20 km of the F1NPP. The results reveal the existence of local 137Cs anomalies, with levels of 137Cs an order of magnitude higher than the surrounding seafloors. The sizes of the anomalies mapped in this work range from a few meters to a few hundreds of meters in length, and it is demonstrated that the distribution of these anomalies is strongly influenced by meter scale features of the terrain.

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e-pub ahead of print date: 10 July 2013
Published date: 15 September 2013
Organisations: Fluid Structure Interactions Group

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Local EPrints ID: 400015
URI: http://eprints.soton.ac.uk/id/eprint/400015
ISSN: 0025-326X
PURE UUID: 87e3f770-88c6-47a3-8cae-a7aa3b861c7d

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Date deposited: 12 Sep 2016 15:37
Last modified: 27 Apr 2022 09:52

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Contributors

Author: Blair Thornton
Author: Seiki Ohnishi
Author: Tamaki Ura
Author: Naoteru Odano
Author: Shun Sasaki
Author: Tsuneo Fujita
Author: Tomowo Watanabe
Author: Kaoru Nakata
Author: Tsuneo Ono
Author: Daisuke Ambe

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