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.