sup.137Cs transfer from soils contaminated by resuspended particles to Japanese mustard spinach in difficult-to-return zone of Fukushima

There is a concern of recontamination to agricultural field and crops by resuspended particles derived from the radioactive contaminated areas in Fukushima Prefecture. We investigated the cesium-137 (.sup.137Cs) transfer from the soil contaminated by resuspended particles to Japanese mustard spinaches. When the contribution of airborne particulate matters to .sup.137Cs activity was large, the proportion of bioavailable .sup.137Cs fractions in the particles increased. Consequently, .sup.137Cs transfer factor of the Japanese mustard spinaches increased. It was considered that the difference in the type of particles might affected the proportion of the bioavailable .sup.137Cs in the particles and its transfer to the crops.