The dust monitoring equipment both inside and outside of the anti-quake building at Daiichi went off on the 19th. Two workers were found with contamination on their heads and TEPCO reconfirmed an order to wear full face masks (respirators) in all areas of the plant.
This problem when it happened last week, TEPCO assumed it was the water misting system for the bus stop nearby. In that incident 10 workers were found to be exposed. This time the water misting system was not in operation. TEPCO does not explain why the dust monitor went off both inside and outside the building. The anti-quake building has a staging area to process and scan people before they are allowed into the controlled area where radiation protection (suits and masks) gear is not required.
A worker that had been exposed elsewhere would be unlikely to set off a dust monitor. What is causing these spikes in contamination near the building is either not known or not admitted by TEPCO.
TEPCO handout (Japanese) http://www.tepco.co.jp/nu/fukushima-np/handouts/2013/images/handouts_130819_03-j.pdf
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