Chemistry Letters, Vol.48, No.11, 1336-1338, 2019
Finding Radiocesium-bearing Microparticles More Minute than Previously Reported, Emitted by the Fukushima Nuclear Accident
Radiocesium-bearing microparticles (CsMPs) with a diameter and Cs-137 radioactivity less than 0.5 mu m and 0.05 Bq, respectively, released by the Fukushima nuclear accident were identified on the ground. These values are considerably lower than those expected for CsMPs in previous studies. Radiocesium-sorbing mineral grains with radioactivity >0.1 Bq were also found in the soil near the nuclear plant. Therefore, it is not reliable to only use the intensity of radioactivity as the criterion for distinguishing CsMPs from radiocesium-sorbing minerals.