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ICRP International

Conference on Recovery After Nuclear Accidents

Radiological Protection Lessons
from Fukushima and Beyond

December 1 - 18, 2020

D.J. Rowan, J. Carr, K. Sharp

Updated: Dec 11, 2020

Recovery Phase Parameters and Models Without an Accident: Fate and Transport of Weapon Test Fallout in the Ottawa River Basin

D.J. Rowan, J. Carr, K. Sharp (Canadian Nuclear Laboratories, Canada)

We use weapon test fallout in the upper Ottawa River basin (59,246 km2) to demonstrate how recovery phase science can be developed a priori in Canada, and present parameters and models that can be used to predict the time course of a fallout event.A mass balance of Cs-137 was constructed from samples of water, sediment, soil, and coniferous, deciduous and understory plants, augmented with historical data.At present, 95% of weapon test fallout Cs 137 remains in the upper Ottawa River basin with only 5% lost through outflow; 80% is in the top 15 cm of soil.Inventories of Cs-137 in soil are remarkably similar throughout the basin (937 ± 66 Bq·m-2) with no significant differences among soil types or kd.Soil to plant transfer, however, varies by several orders of magnitude with very low transfer from soils derived from glacio-lacustrine clays and much higher transfer from soils with little clay.



D.J. Rowan, J. Carr, K. Sharp (Canadian Nuclear Laboratories, Canada)

我々はいかにしたらカナダで復旧段階の科学を先験的に開発できるのかを実証し、降下物事象の時間的経過を予測するために使用できるパラメータとモデルを提示するために、オタワ川上流域(59,246 km2)での兵器実験降下物を用いる。Cs-137の質量収支は過去のデータに加えて、水、堆積物、土壌、針葉樹、落葉樹及び下層植物のサンプルから組み立てられた。現在、兵器実験のCs-137降下物の95%がオタワ川上流域に残っており、流出によって失われたのは5%のみで、80%が土壌の最上層15 cmに存在している。土壌中のCs-137のインベントリは流域全体で極めて類似しており(937 ± 66 Bq Ÿ m-2)、土壌の種類やKdの間に有意な差は見られない。しかし、土壌から植物への移行には数桁の差があり、氷河湖成粘土に由来する土壌からの移行率は非常に低く、粘土がほとんど含まれない土壌からの移行率ははるかに高い。

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