Plant uptake of neptunium-237 and technetium-99 under field conditions |
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| Institution: | 1. Research Center Rez Ltd, 250 68 Husinec-Rez 130, Czech Republic;2. Masaryk University, Botanická 15, Brno 612 00, Czech Republic;3. Dept. of Nuclear Reactors, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Czech Republic;4. University of Defence, Kounicova 65, Brno 612 00, Czech Republic;1. Nuclear Science and Engineering Program, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA;2. Department of Physics, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA |
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| Abstract: | Plant uptake of 99Tc freshly added to soils was compared with uptake of 99Tc ‘aged’ in soil for more than a decade. A combination of alkaline soil and freshly added 99Tc resulted in elevated uptake into radish foliage (plant/soil concentration ratios ranged from 37 to 46). Neptunium-237 was freshly added to all soils. Neptunium uptake via plant roots into foliage was strongly affected by soil pH. Neptunium uptake was greatest from acidic soils. The observed plant/soil concentration ratios for 237Np under field conditions were approximately 10−2 from acidic soils (pH 5·6–5·7) and were comparable to field concentration ratios for 239Pu, that is 10−3, from a basic soil (pH 7·5). |
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