High Radiation Levels in Kashiwa Linked to TEPCO N-Plant, Jiji Press, Nov. 28, 2011:
The Ministry of Environment said Monday that high radiation levels detected in soil in Kashiwa, northeast of Tokyo, in October are likely to be from radioactive cesium released from Tokyo Electric Power Co.’s Fukushima [...]
The ministry said it believes that the contamination was caused by rainwater containing radioactive cesium [...]
The ministry detected up to some 450,000 becquerels per kilogram of radioactive substances in the soil in Kashiwa, higher than the levels of up to 276,000 becquerels found in the city’s research. [...]
To compare these soil contamination levels to those after the Chernobyl meltdown, a conversion from becquerels per kilogram to becquerels per square meter is used.
“To convert from ‘per kilogram’ to ‘per square meter’, Japan’s Nuclear Safety Commission uses the factor of 65.” (SOURCE)
Therefore, 29,250,000 Bq/m² of radioactive substances were in the Kashiwa soil.
At Chernobyl, cesium contamination above 1,480,000 Bq/m² required migration, 555,000-1.48 million Bq/m² was for temporary migration.
Published: November 28th, 2011 at 5:52 pm ET