Between the Poles: Fukushima Daiichi: Iodine-131 concentrations in seawater decreasing but still high

Geoff Zeiss

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April 13, 2011

Fukushima Daiichi: Iodine-131 concentrations in seawater decreasing but still high

TEPCO has released new measurements of concentrations of iodine-131 in seawater samples taken near the plant.

Near water intake of Unit 2 on Tuesday Apr 12 afternoon

100 Bq/cm³ of iodine-131 (2,500 times the legal limit)

30 meters north of Units 5 and 6 outlets on Tuesday Apr 12 afternoon

1.7 Bq/cm³ of iodine-131 (43 times the legal limit)

TEPCO released 1,320 tons of water with low radioactivity into the ocean near the outlets of Uints 5 and 6 over a six day period culminating April 9.

16 km south of the plant on Tuesday Apr 12 morning

1.1 Bq/cm³ of iodine-131 (28 times the legal limit)

Previous measurments near the water intake of Unit 2

Wednesday Apr 6 7:40 am

5,600 Bq/cm³ radioactive iodine-131 (140,000 times higher than legal limit)

Tuesday morning Apr 5

11,000 Bq/cm³ of iodine-131 (280,000 times higher than the legal limit

Monday Apr 4 9am

200,000 Bq/cm³ iodine-131 (5 million times the legal limit)
1.1 million times the legal limit of cesium 137

Saturday Apr 2

300,000 Bq/cm³ iodine-131 (7.5 million times the legal limit)

Previous measurements near the water outlet of the Unit 5 and 6 reactors

Tuesday Apr 5

24 Bq/cm³ of iodine-131 (600 times higher than the legal limit)

The Japanese science ministry has conducted a computer simulation of the movement of iodine-131, which suggest that it will be carried south by an off-shore current, then move east with another current off Ibaraki Prefecture in about a month.

Posted at 08:59 PM in Electric Power, Environment, Fukushima Nuclear Incidents | Permalink

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Between the Poles

Geoff Zeiss

March 2023

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April 13, 2011

Fukushima Daiichi: Iodine-131 concentrations in seawater decreasing but still high

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