There's a newspaper published by a citizen group in Soma City, Fukushima, urging the former residents, particularly mothers with children, to return to the city. Soma City is located just north of Minami Soma City where the "black dust" was first reported by Assemblyman Ooyama.
It turns out (no real surprise, but...) that Soma City also has "black dust" with very high radiation. The newspaper that urges mothers to come back has this article in its May 2012 issue:
Please be careful!
On the roads and near the side drains by the side walks in Minami Soma City and Soma City, we've started to see the black substance that looks like dirt. There has been some media report on this substance, and it is said to be a certain kind of bacteria that has dried out. It has been known to have very high radiation levels, and there is a possibility that it affects human bodies. Please do not go near it. We placed the survey meter on the substance in the photo. The survey meter shows 56.3 microsieverts/hour. Young children in particular should pay attention.
Again, the group wants mothers with children who evacuated from the city to come back. The reason why the group is publishing the newspaper is, according to the website:
We want to protect our children.
We want to keep hope for the future.
TO do that, we will "change" our way of life.
We will "change" the city into a healthy city.
How are they going to achieve that? By measuring radiation, as far as I could tell from their newspaper.
Sorry to say it but the "bamboo spear" spirit seems to be alive and well in Japan, even after 67 years.