Kashiwa City's Radioactive Dirt: 276,000 Bq/Kg of Cesium
The highly radioactive dirt in Kashiwa City in Chiba, which measured 57.5 microsieverts/hr 30 centimeters below the surface, was not from radium after all or any other nuclides that are used in industrial or medical use (some suggested cobalt-60, for example). It was from radioactive cesium.
On October 22 Kashiwa City announced the result of the analysis of three dirt samples from the location at different depth (one on the surface, two at 30 centimeter deep). The analysis was done on October 22. The unit is becquerels per kilogram:
Sample A (surface dirt)
Radioactive iodine: ND
Cesium-134: 70,200
Cesium-137: 85,100
Total cesium: 155,300
Sample B1 (30 centimeters below the surface)
Radioactive iodine: ND
Cesium-134: 87,000
Cesium-137: 105,000
Total cesium: 192,000
Sample B2 (30 centimeters below the surface)
Radioactive iodine: ND
Cesium-134: 124,000
Cesium-137: 152,000
Total cesium: 276,000
The address of the location is announced by the city as: 柏市根戸字高野台457番3地先. According to the residents, the place is a strip of open space between the residential area and the industrial area, and is used as playground by many residents, young and old.
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