Saturday, October 22, 2011

Kashiwa City's High Radiation Dirt: Natural Concentration?

57.5 microsieverts/hour radiation on the dirt in Kashiwa City that has maximum 276,000 becquerels/kg of radioactive cesium of Fukushima origin was caused by natural concentration by rainwater flowing into the particular location, according to the city who's having a press conference on the scene.

According to the Ministry of Education and Science, there is a drain that collects rain water at that particular location and the drain broke for some unknown reason, contaminating the location.

Really? 57.5 microsieverts/hour?


Anonymous said...

Ridicolous. If its really cesium it won't be natural anyway. Natural Radiation is mostly caused by radon gas. That could Actually as high as 300.000Bq/kg...

Anonymous said...

Scintillators can identify specific isotopes.

Let's use them, yes?

Anonymous said...

From Nikkei (not a translation - just summarizing the points):

Max of 276,000 bq/kg of Cesium recorded from the soil samples.

According to the Ministry of Education and Science said they cannot rule out the possibility of the radiation sourced from Fuku as the ratio of Ce134 and Ce137 are representative of the fuku disaster.


The people there are stuck with the soil for some time while authorities try to figure out where the radiation is coming from and how to remove it.

I am guessing turning the soil over ain't going to help in this case.

Anonymous said...

Here is a Japanese article about it:

Anonymous said...

I have measured personally >25µSv/h under drainpipes of a building in Kashiwa city (at close range). Over 50 is certainly feasible.

Note also that Nedo is in the 2000 CPM line

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