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To evaluate the mobility and bioavailability of 137 Cs in soils, we compared the extraction of 137 Cs with stable Cs and ammonium solutions from 137 Cs-contaminated minerals and soils. The extraction yields of 137 Cs with stable Cs were significantly lower than those with ammonium for minerals with frayed edge sites, but such differences were not observed for minerals without frayed edge sites. The amount of 137 Cs extracted with stable Cs from soils was lower than, or equal to, that extracted with ammonium. The above results suggest that stable Cs extracted the 137 Cs from easily accessible sites. Plant available 137 Cs was assessed using Kochia (Bassia scoparia) cultivated in pots of contaminated soils, and compared with soil parameters including extractable 137 Cs and K, and radiocesium intercept potential. The 137 Cs/K ratio extracted with stable Cs solution was found to be a potential index for evaluation of the easily mobile and bioavailable fraction of 137 Cs in soil.

Comparison of 0.1 M Stable CsCl and 1 M NH4NO3 as an Extraction Reagent to Evaluate Cs-137 Mobility in Soils