Measurement and Decontamination of Radiocesium on Fir (<i>Abies firma</i>) and Camellia (<i>Camellia japonica</i>) Leaves in Fukushima City

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  • 福島市のモミ(<i>Abies firmer</i>)およびツバキ(<i>Camellia japonica</i>)の葉における放射性セシウム汚染と除染
  • 福島市のモミ(Abies firmer)およびツバキ(Camellia japonica)の葉における放射性セシウム汚染と除染
  • フクシマシ ノ モミ(Abies firmer)オヨビ ツバキ(Camellia japonica)ノ ハ ニ オケル ホウシャセイ セシウム オセン ト ジョセン

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Abstract

  Pollutants on radiocesium contaminated fir and camellia leaves in Northern Fukushima prefecture were measured and decontaminated after the accident at TEPCO's Fukushima Daiichi nuclear power plant. The surface contamination of the leaves of the fir and the camellia leaves was measured by washing by hand with water; the contaminants were then removed by deposition. Leaves that had unfolded more than three years ago were polluted by a high concentration of Cs-137+Cs-134; 7,070±129 Bq/kg in fir and 6,610±195 Bq/kg camellia. Lower position leaves of large camellia plants showed higher levels of radiocesium concentration compared with them of small plants. The radiocesium contamination of leaves decreased to one-fifth (fir) and one-quarter (camellia) by hand rubbing with water before washing. 99.4% of radiocesium contamination from fir leaves and 90.8% of radiocesium contamination from camellia. A large amount of the radiocesium surface contamination on fir and camellia could be removed by rubbing leaf surfaces with water, and the contamination was collected by deposition processing.<br>

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