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Radiocesium dissolves easily in water, allowing it to spread quickly. However, different soils have the ability to retain various toxins and prevent them from spreading or entering the food chain. The authors measured the ability of a large number of soil samples collected from Fukushima to intercept radiocesium. They found success depends on various factors.

One key factor is the presence of rough or weathered edges of certain minerals, such as mica, in the soil. These rough edges catch the radiocesium and prevent its movement. This is the frayed edge site (FES) concentration. Nakao explains, however, that “quantification of the FES with a simple experiment has proven difficult.” A “surrogate” measurement used by soil scientists is the radiocesium interception potential (RIP). This measurement is time-consuming and requires specialized facilities, preventing its measure at local institutes.

Thus, Nakao’s study looked for and found that other, more easily measured soil properties to predict the radiocesium interception potential (RIP) of a soil. “These findings may be useful in screening soils that are particularly vulnerable to transferring radiocesium to plants grown in them,” Nakao says. “However, the amounts of radiocesium transferred to plants are normally negligible, because most of the radiocesium is strongly fixed on the frayed edge site.”……..http://www.sciencedaily.com/releases/2015/03/150324101006.htm