20,201 Bq/Kg and 14,531 Bq/Kg of cesium was measured from the dust of vacuum.
The former one was taken in Nagareyama Chiba, the later one was taken in Ibaraki.
Co-op Joso and National Institute for environmental studies measured dusts in vacuum cleaner in 257 houses of South Ibaraki and North-West Chiba, where are known to be hotspot.
The measurement was done in April 2012.
As a result, they measured 1,956 Bq/Kg of cesium from the dusts in vacuum cleaner at average.
The highest reading was 20,201 Bq/Kg and the second highest reading was 14,531 Bq/Kg, which are beyond the safety limit of 8,000 Bq/Kg, which is allowed to fill land as incineration ash.
According to the study of Pathological anatomist, Yury Bandazhevsky from Belarus, 90% of the children in Homyel to have 37 – 74Bq/kg of cesium measured from their cardiac muscle showed abnormal electrocardiogram.
Highly concentrated cesium in dust causes serious internal exposure to breathe in.