Fukushima Marine Environment Monitoring - 19 April 2011
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Fukushima Marine Environment Monitoring - 19 April 2011
- 1. Marine Environment Monitoring Assessment of IAEA Environment Laboratories on Data from the Marine Environment provided by Japan Update 19 April IAEA Environment Laboratories, Monaco
- 3. Authorised discharge of low level contaminated water (4 April)
- 6. Since 5th of April six points situated 15 km off-shore along a north-south transect (TEPCO 5-10)
- 9. Concentrations in sea water further off-shore about 15 km from the coast
- 11. Additional sampling stations at 10 and 20 km offshore, for which both surface and bottom seawater are sampled (No. 9 and 10)
- 12. On 4th April MEXT added stations A and B north-west of the sampling point 1 after discussion with the IAEA Environment Laboratories, MonacoMap 1
- 13. 15th April showed that Cs-137 and I-131 were detected at MEXT 4, 6 and 8. The highest concentrations were recorded at MEXT 4 (below 200 Bq/l for Cs-137 and about 160 Bq/l for I-131). At MEXT 6 and 8 sampling locations both Cs-137 and I-131 were reported at levels below about 40 Bq/l. The results reported on 19th April (sampling date 17th April) showed that at the stations MEXT 5, 7 and 9, Cs-137 and I-131 are below 90 Bq/l. Both Cs-137 and I-131 are “not detectable” at MEXT A and B. Seawater sampling carried out by Japanese Authorities MEXT
- 15. Concentration data from about 30 km off-shore show a generally decreasing temporal trend