Long-term monitoring of radiocesium deposition near the Fukushima Dai-ichi nuclear power plant. Effect of interception of radiocesium on vegetables

Monthly depositions of ¹³⁴Cs and ¹³⁷Cs at the site near the Fukushima Dai-ichi nuclear power plant has been monitored continuously since March 2011. The higher monthly ¹³⁷Cs deposition, exceeded 1 kBq m^-2, was observed in January-March 2017. When higher radioactive deposition continues, interception is an important pathway to radioactive contamination of plants. We, therefore, calculated a conventional interception factor (0.5 m² kg^-1 w.w.) from monitoring values of the ¹³⁷Cs concentrations in leaves and monthly ¹³⁷Cs deposition in 2011. (author)