These are Clovers from Tomioka (approx. 9 km from the Daiichi powerplant in Fukushima, Japan) Picked on July 31 in the year 2017. They grew at the decontaminated soil on the ground of a deconstructed house. Many of them have four (or even more) leaves.
Official radiation level in Tomioka is below 20 milisievert per year since April 2017, so it's completely safe.