Tuesday, November 15, 2011

#Radiation in Japan: 60,000 Bq/kg Cesium in Riverbed Soil in Fukushima

From Tokyo Shinbun, quoting Kyodo News (11/15/2011):


On November 15, the Ministry of the Environment announced the result of the survey of the radioactive material density in bottom soil in 193 locations in rivers, lakes and dams in Fukushima Prefecture. Radioactive cesium was detected in almost all locations, with the highest density of 60,000 becquerels/kg of radioactive cesium in the riverbed soil in the Ota River that runs through Minami Soma City, which was designated as "evacuation-ready zone" after the Fukushima I Nuclear Power Plant accident.


The Ministry also conducted the survey of the water. Maximum 27 becquerels/liter of radioactive cesium was detected in the water from a dam inside the "no-entry zone" [within 20-kilometer radius], but in most locations it was not detected. The Ministry's analysis is that "radioactive materials have been absorbed by sludge and sands and sunk to the bottom, and that is why the radiation density is high [in the soil in rivers, lakes and dams]."

The survey result is not yet uploaded at the Ministry's website.

The provisional "safety" standard for drinking water in Japan is 200 becquerels/liter of radioactive cesium. (For reference, in Belarus, it is 10 becquerels/kg.)


Anonymous said...

I like how they switch between bq/kg. and bq/lt. It is a trick they have used with all measurements during this entire event. Keep everyone confounded and nobody will be able to figure out the dangers. This is horrible.

Anonymous said...

this can't be good

Anonymous said...

I think they change between Bq/Kg and Bq/lt cause in one cause they are measuring soil contamination and in the other they are measuring water contamination.

Anonymous said...

and.... one liter of water weighs one kilogram, so essentially its the same. Nobody who uses the metric system would find this info to be particularly confounding.

Anonymous said...

I would also mention that I don't think the Japanese people should be particularly horrified at 27 becquerels per liter of water inside the "no entry zone".

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