首页> 外文期刊>Journal of Environmental Radioactivity >Impacts of C-uptake by plants on the spatial distribution of C-14 accumulated in vegetation around a nuclear facility-Application of a sophisticated land surface C-14 model to the Rokkasho reprocessing plant, Japan
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Impacts of C-uptake by plants on the spatial distribution of C-14 accumulated in vegetation around a nuclear facility-Application of a sophisticated land surface C-14 model to the Rokkasho reprocessing plant, Japan

机译:植物吸收碳对核设施周围植被中积累的C-14的空间分布的影响-复杂的地表C-14模型在日本六所町后处理厂的应用

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摘要

The impacts of carbon uptake by plants on the spatial distribution of radiocarbon (C-14) accumulated in vegetation around a nuclear facility were investigated by numerical simulations using a sophisticated land surface C-14 model (SOLVEG-II). In the simulation, SOLVEG-II was combined with a mesoscale meteorological model and an atmospheric dispersion model. The model combination was applied to simulate the transfer of (CO2)-C-14 and to assess the radiological impact of C-14 accumulation in rice grains during test operations of the Rokkasho reprocessing plant (RRP), Japan, in 2007. The calculated C-14 specific activities in rice grains agreed with the observed activities in paddy fields around the RRP within a factor of four. The annual effective dose delivered from C-14 in the rice grain was estimated to be less than 0.7 Sv, only 0.07% of the annual effective dose limit of 1 mSv for the public. Numerical" experiments of hypothetical continuous atmospheric (CO2)-C-14 release from the RRP showed that the C-14-specific activities of rice plants at harvest differed from the annual mean activities in the air. The difference was attributed to seasonal variations in the atmospheric (CO2)-C-14 concentration and the growth of the rice plant. Accumulation of 14C in the rice plant significantly increased when (CO2)-C-14 releases were limited during daytime hours, compared with the results observed during the nighttime. These results indicated that plant growth stages and diurnal photosynthesis should be considered in predictions of the ingestion dose of C-14 for long-term chronic releases and short-term diurnal releases of (CO2)-C-14, respectively. (C) 2016 Elsevier Ltd. All rights reserved.
机译:通过使用复杂的陆地表面C-14模型(SOLVEG-II)进行数值模拟,研究了植物吸收碳对核设施周围植被中累积的放射性碳(C-14)空间分布的影响。在模拟中,SOLVEG-II与中尺度气象模型和大气扩散模型相结合。该模型组合用于模拟(CO2)-C-14的转移,并评估了2007年日本六所庄后处理厂(RRP)的测试运营期间水稻籽粒中C-14积累的放射学影响。稻米中C-14的比活与RRP周围稻田中观察到的活度相差四倍。据估计,C-14在水稻籽粒中提供的年度有效剂量小于0.7 Sv,仅为公众1 mSv年度有效剂量限值的0.07%。 RRP假设的连续大气(CO2)-C-14释放的数值实验表明,收获时水稻植株的C-14特定活动与空气中的年平均活动有所不同。该差异归因于与夜间观察到的结果相比,白天(CO2)-C-14的释放受到限制时,水稻中14C的积累显着增加。这些结果表明,在预测C-14的长期长期释放和短期昼间(CO2)-C-14的摄入量时,应分别考虑植物的生长阶段和昼夜光合作用。 2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Journal of Environmental Radioactivity》 |2016年第10期|189-204|共16页
  • 作者单位

    Japan Atom Energy Agcy, Nucl Sci & Engn Ctr, Res Grp Environm Sci, Tokai, Ibaraki 3191195, Japan;

    Japan Atom Energy Agcy, Nucl Sci & Engn Ctr, Res Grp Environm Sci, Tokai, Ibaraki 3191195, Japan;

    Japan Atom Energy Agcy, Nucl Sci & Engn Ctr, Res Grp Environm Sci, Tokai, Ibaraki 3191195, Japan;

    Japan Atom Energy Agcy, Nucl Sci & Engn Ctr, Res Grp Environm Sci, Tokai, Ibaraki 3191195, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    C-14; Photosynthesis; Rice plant; Land surface model; Atmospheric dispersion model; Dose estimation;

    机译:C-14;光合作用;水稻;陆面模型;大气弥散模型;剂量估算;
  • 入库时间 2022-08-17 13:35:13

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