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ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

T.A. Paramonova, O.L. Komissarova, N.V. Kuzmenkova

Updated: Dec 11, 2020

Sanitary Control of Carrot Grown on Chernozems Contaminated with Cs-137, 30 Years After the Chernobyl Accident

T.A. Paramonova (Lomonosov Moscow State University, Russia), O.L. Komissarova (Lomonosov Moscow State University, Russia), N.V. Kuzmenkova (Lomonosov Moscow State University, Russia; Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia)


To assess the sanitary safety of root crops cultivation in the areas affected by accidental radioactive fallout, a study of Cs-137 transfer from soil to carrot plants was carried out in the Plavsk radioactive hotspot (Tula region of Russia) with the initial range of soil contamination in 1986 – 185-555 kBq/m2. Despite the remaining contemporary 5-fold excess of the permissible Cs-137 level in arable chernozems of the territory (184 kBq/m2), the radionuclide transfer to carrot is characterized by low intensity (transfer factor 1.2∙10-2) due to the strong irreversible fixation of Cs-137 in clay soils and the rhizofiltration ability of the crop. It is noteworthy that the roots (edible part) of carrot accumulate Cs-137 in ≈6 times less than shoots (4.7±0.9 and 28.7±6.5 Bq/kg, respectively). Thus, the values of Cs-137 specific activity in carrot completely correspond to the sanitary standard, which confirms the possibility of growing this crop in the investigated area.

チェルノブイリ事故から30年後、Cs-137で汚染されたチェルノーゼムで栽培されたニンジンの衛生管理

T.A. Paramonova (Lomonosov Moscow State University, Russia), O.L. Komissarova (Lomonosov Moscow State University, Russia), N.V. Kuzmenkova (Lomonosov Moscow State University, Russia; Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia)


事故による放射性降下物の影響を受けた地域での根菜作物栽培の衛生上の安全を評価するため、1986年の初期土壌汚染範囲が185~555 kBq/m2であったプラフスクの放射性ホットスポット(ロシアのトゥーラ地域)において、土壌からニンジンへのCs-137の移行に関する調査が実施された。同地域の耕作可能なチェルノーゼムで、現在はCs-137の許容レベルの5倍以上が残っているにもかかわらず(184 kBq/m2、ニンジンへの放射性核種の移行は、粘土質土壌でのCs-137の強い不可逆的な固定、及び作物の根圏ろ過能力のため、低強度(移行係数1.2 Ÿ 10-2)であることを特徴とする。注目すべきは、ニンジンの根(可食部)のCs-137蓄積量が新芽の約6分の1と少ないことである(それぞれ4.7 ± 0.9、28.7 ± 6.5 Bq/kg)。そのため、ニンジンのCs-137比放射能の値は衛生基準値と完全に一致しており、これは調査地域でのこの作物の栽培の可能性を確認するものである。

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