Collage made out of flowers picked on July 30 in the year 2017 in Okuma. (approx. 8 km from the Daiichi powerplant in Fukushima, Japan) This is a lokation situated in the Red Zone or 'no return zone' of Fukushima prefecture, Japan. Which means that the radiation level is high. (over 20 milisievert per year)
Only former residents are allowed to enter this area for a few hours per day max. Being there without proper protection is not safe.
The flower collages are stored in a box of concrete. No radioactive parts will get through.
That makes it completely safe.