Due to concerns about radiation in Tokyo from a number of our readers, Firipin.net will publish hourly radiation level measurements provided by government and other organizations.

Environmental Radiation Measurement Result

Data Source: Japan Advanced Institute of Science and Technology
Monitoring Place: Hyakunincho, Shinjuku-ku Tokyo
Unit: μGy/h (Microgray/hour)
Gray unit represents the amount of enery deposited when a substance is exposed to radiation.  1 gray radiation in the atmosphere is equivalent to 1 sievert.

Take note that the levels in the Daiichi Nuclear Power plant before the earthquake ranged from 0.028 to 0.079 microsievert per hour.

Move the mouse over the chart to view details for each time-level pair.