Fukushima Marine Environment Monitoring - 12 April 2011

1. Marine Environment Monitoring Assessment of IAEA Environment Laboratories on Data provided by Japan Update 12 April IAEA Environment Laboratories, Monaco

3. Authorised discharge of low level contaminated water (4 April)

5. Additional sampling stations at 10 and 20 km offshore, for which both surface and bottom seawater are sampled (10-9)

6. On 4th April MEXT added stations A and B north-west of the sampling point 1

7. At the sampling points 1-8 levels of I-131 and Cs-137 show a quite a decreasing time trend

8. More variations are observed at stations 9 & 10Map 1

10. Since 5th of April 6 points situated 15 km off-shore along a north-south transect (TEPCO 5-10)

11. The levels of I-131 and Cs-137 at the sampling point TEPCO 5-10 are lower than those at the near-shore stations (below 0.5 kBq/l)

14. Concentration data from about 30 km off-shore show a quite a decreasing time trend