strange roses

I found these photos recently, they were taken  May, 2011

in Tokyo
http://d.hatena.ne.jp/nya0/20110508/p4

in Fukushima
http://country-season.asablo.jp/blog/2011/05/29/5888269



By the way, highly radioactive contaminated hot spot ( 2.707 μSv/h) was found in Setagara ward in Tokyo. It was footway on which many ppl have been passing every day.
The number 2.707 μSv/h looks strange. It is too high. This number is higher than home zone in Fukushima.
I wonder which is scarer, one version;  Tokyo (and Japan) has so many  hidden hot spots like this, and they only have not found yet, Or.. the other version;   someone  dumped  highly radioactive  contaminated thing here,  it is very easy to get such hazardous materials in Japan.