Abstract
Most of the radioactive cesium (134Cs and 137Cs), which originated from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, has remained in the soil and on plants as water-insoluble microparticles (termed as CsMPs) and maintained relatively high radioactivity levels in the district. However, it has been reported that the radioactive Cs has been absorbed by plants. To interpret this phenomenon, the authors investigated CsMPs to determine if they become soluble during filtration and dialysis experiments. Moreover, other physical properties, such as mechanical properties and thermal stability, were observed during the course of the relevant experiments. These properties can be obtained by using carbonized charcoal litter with CsMPs.
Highlights
A wide area of northeastern Japan was contaminated by the discharge of radioactive Cs (134Cs and 137Cs) from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident
Many researchers reported that some radioactive Cs have not been absorbed or trapped in the soil, but they exist as fine particles that are insoluble [7,8,9,10,11,12,13,14,15,16,17]
After incubation, the radioactivity corresponded to 0.16±0.01 Bq/g, which implies that radioactive Cs was exposed on the surface of the CsMPs on the raw litter and when it came in contact with water, it transformed into ions and eluted in water
Summary
A wide area of northeastern Japan was contaminated by the discharge of radioactive Cs (134Cs and 137Cs) from the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident. Radioactive Cs that falls on the ground has been reported to be adsorbed and trapped in soil minerals [6]. Many researchers reported that some radioactive Cs have not been absorbed or trapped in the soil, but they exist as fine particles that are insoluble [7,8,9,10,11,12,13,14,15,16,17]. We refer to these insoluble Cs fine particles as CsMPs. In this paper, we refer to these insoluble Cs fine particles as CsMPs In this insoluble fine particle form, radioactive Cs should not be absorbed by plants because it is not soluble. It is well known that various types of plants in the radioactive Cs-contaminated soils were radioactively contaminated and were not decontaminated by washing [18,19,20]
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