http://houseoffoust.com/group/?p=3610These are the bottles that caused all the trouble in Tokyo.

“According to Setagaya-ku and the Ministry of Education and Science, the bottles look to be made of glass, about 7 centimeters long and 5 to 6 centimeters in diameter. There are several tens of bottles in a wooden box. The content of the bottles are powdery.The radiation was so high that the survey meter that they brought couldn’t measure as it went overscale. No one is currently living in that house.”
The bottles are likely an old “quack cure” radium powder similar to ones in the Oak Ridge Associated Universites museum

What is concerning is how much radiation was being put out and EX-SKF also mentions that it doesn’t explain why the sidewalk is still showing rather high radiation after decontamination.