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論文

Secondary radiocesium contamination of agricultural products by resuspended matter

二瓶 直登*; 吉村 和也; 奥村 大河*; 田野井 慶太朗*; 飯島 和毅; 小暮 敏博*; 中西 友子*

Journal of Radioanalytical and Nuclear Chemistry, 318(1), p.341 - 346, 2018/10

 被引用回数:1 パーセンタイル:70.85(Chemistry, Analytical)

Komatsuna (${it Brassica rapa L.}$) was cultivated in pots using non-contaminated soil and water, and the pots were arranged 30, 60, and 120 cm above the ground surface. The experiment site was located 4.5 km from the Fukushima Daiichi Nuclear Power Plant and had an ambient dose rate of approximately 1.4 $$mu$$Sv/h. The radiocesium concentration in the above ground parts without washing ranged from 22 to 333 Bq/kg (dry weight). The radiocesium concentration in the washed plants was predominantly lower than in the un-washed plants. Komatsuna cultivated lower to the ground tended to have a higher radiocesium concentration. Therefore, it can be posited that radiocesium detected in Komatsuna leaves was derived from ground surface.

口頭

Radiocesium migration to agricultural products by resuspended matter

二瓶 直登*; 吉村 和也; 中西 友子*

no journal, , 

The purpose of this study was to assess radiocesium migration to crops caused by external adsorption and internal absorption and to analyze the fallout matter to show the cause of the radiocesium migration. Japanese mustard spinach was cultivated using noncontaminated soil and water in a pot at six sites in Fukushima prefecture in 2018. The plants were washed with water after havesting, and then measured radiocesium concentration which was supposed to indicate internal absorption. Fallout matter was also collected using basins filled with water during the cultivation. The radiocesium concentrations in spinach varied with the cultivation place and time. Most radiocesium in the fallout matter was in the suspended phase, but the radiocesium concentration in the spinach was highly correlated with the dissolved radiocesium in the fallout matter. Internal absorption is considered to absorb dissolved radiocesium in the fallout matter from leaves directly or from roots indirectly.

口頭

放射性微粒子の作物栽培への影響解析

二瓶 直登*; 吉村 和也

no journal, , 

本研究は、再浮遊した放射性Csの作物への移行量とその要因を検討した。供試作物としてコマツナを用い、大熊町, 富岡町で非汚染土壌、非汚染水を用いてポット栽培した。併せて大気降下物中の放射性Cs量を評価するためポット脇に容器に入れた水も設置した。コマツナ地上部の放射性Cs濃度は4-57Bq kg$$^{-1}$$(乾物重)、降下物は15-370Bq m$$^{-2}$$であり、同場所においても季節により変動した。収穫後水洗浄したコマツナの放射性Cs濃度は洗浄前に比べて低下した。更に、地際30cmで栽培したコマツナの放射性Cs濃度は120cmで栽培したコマツナに比べて高く、地表面からの再浮遊物の影響が想定された。

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