Radioactive Concentration measured at Dust Monitors near the Site Boundary of Fukushima Daiichi Nuclear Power Station

The following are radioactive concentrations in the air measured near the monitoring posts (MP1-8) at the site boundary of Fukushima Daiichi Nuclear Power Station.

Monitoring points

Expansion

Radiation concentration

Expansion

※"－"： the wind velocity is below 0.5 m/s

※Wind direction and speed are measured by a meteorological observation instrument, installed on the west side of the
Seismic Isolation Building, at 10m above ground level.

※０.０E^－○ signifies ０.０×１０^－○
　　　Example：１.０E^－６ signifies １.０×１０^－６（＝０．０００００１０）.

※Lower limit：１.０E^－６（Ｂｑ/ｃｍ³）

   ◇Fluctuation in Radioactive Concentrations in the Air
       The radioactive concentrations in the air for natural nuclides such as Radon may fluctuate during the day depending
       on weather conditions such as temperature, wind velocity, and rainfall.

○Announcement

*Data may be missing due to regular inspections and cleanup work. *Duplicate measurement near the MP 1 to 8 has been begun from December 19, 2018.