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首页> 外文期刊>Environmental Science & Technology >Real-Time Gamma Imaging of Technetium Transport through Natural and Engineered Porous Materials for Radioactive Waste Disposal
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Real-Time Gamma Imaging of Technetium Transport through Natural and Engineered Porous Materials for Radioactive Waste Disposal

机译：Natural通过天然和工程多孔材料进行放射性废物处置的实时伽马成像。

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摘要

We present a novel methodology for determining the transport of technetium-99m,a γ-emitting metastable isomer of ~(99)Tc,through quartz sand and porous media relevant to the disposal of nuclear waste in a geological disposal facility (GDF).Quartz sand is utilized as a model medium,and the applicability of the methodology to determine radionuclide transport in engineered backfill cement is explored using the UK GDF candidate backfill cement,Nirex Reference Vault Backfill (NRVB),in a model system.Two-dimensional distributions in ~(99m)Tc activity were collected at mUlimeter-re solution using decay-corrected gamma camera images.Pulse-inputs of ～20 MBq ~(99m)Tc were introduced into short (＜10 cm) water-saturated columns at a constant flow of 0.33 mL rnin~(-1) .Changes in calibrated mass distribution of ~(99m)Tc at 30 s intervals,over a period of several hours,were quantified by spatial moments analysis.Transport parameters were fitted to the experimental data using a one-dimensional convection-dispersion equation,yielding transport properties for this radionuclide in a model GDF environment.These data demonstrate that ~(99)Tc in the pertechnetate form (Tc(Ⅶ)O_4~-) does not sorb to cement backfill during transport under model conditions,resulting in closely conservative transport behavior.This methodology represents a quantitative development of radiotracer imaging and offers the opportunity to conveniently and rapidly characterize transport of gamma-emitting isotopes in opaque media,relevant to the geological disposal of nuclear waste and potentially to a wide variety of other subsurface environments.
机译：我们提出了一种新颖的方法来确定the-99m（〜（99）Tc的发射γ的亚稳态异构体）通过石英砂和与在地质处置设施（GDF）中处置核废料有关的多孔介质的传输。以砂作为模型介质，并在模型系统中使用UK GDF候选回填水泥Nirex Reference Vault Backfill（NRVB）探索了该方法确定工程回填水泥中放射性核素迁移的方法的适用性。使用衰减校正后的伽马相机图像在毫米分辨率下收集〜（99m）Tc活性。将〜20 MBq〜（99m）Tc的脉冲输入以恒定流量引入到短（<10 cm）的水饱和柱中约0.33 mL rnin〜（-1）。〜（99m）Tc的校准质量分布在30 s间隔内变化，在数小时内通过空间矩分析进行定量。运输参数使用a拟合至实验数据一维对流扩散方程，在模型GDF环境中具有这种放射性核素的输运性质。这些数据表明，在模型条件下的输运过程中，高tech酸盐形式的〜（99）Tc（Tc（Ⅶ）O_4〜-）不会吸收到水泥回填中。该方法代表了放射性示踪剂成像的定量发展，并提供了机会，可以方便，快速地表征不透明介质中与伽马发射同位素有关的运输，这与核废料的地质处置以及潜在的多种其他地下环境。

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  • 来源
    《Environmental Science & Technology》 |2013年第23期|13857-13864|共8页
  • 作者

    Claire L.Corkhill; Jonathan W.Bridge; Xiaohui C.Chen; Phil Hillel; Steve F.Thornton; Maria E.Romero-Gonzalez; Steven A.Banwart; Neil C.Hyatt;

  • 作者单位

    Immobilisation Science Laboratory,Department of Materials Science and Engineering,The University of Sheffield,Sheffield,South Yorkshire SI 3JD,United Kingdom,Kroto Research Institute,Department of Civil and Structural Engineering,The University of Sheffield,Sheffield,South Yorkshire S3 7HQ,United Kingdom;

    Kroto Research Institute,Department of Civil and Structural Engineering,The University of Sheffield,Sheffield,South Yorkshire S3 7HQ,United Kingdom,Centre for Engineering Sustainability,School of Engineering,University of Liverpool,Liverpool,Merseyside L69 7ZX,United Kingdom;

    Kroto Research Institute,Department of Civil and Structural Engineering,The University of Sheffield,Sheffield,South Yorkshire S3 7HQ,United Kingdom;

    Department of Nuclear Medicine,Sheffield Teaching Hospitals NHS Foundation Trust,Sheffield,South Yorkshire S10 2JF,United Kingdom;

    Kroto Research Institute,Department of Civil and Structural Engineering,The University of Sheffield,Sheffield,South Yorkshire S3 7HQ,United Kingdom;

    Kroto Research Institute,Department of Civil and Structural Engineering,The University of Sheffield,Sheffield,South Yorkshire S3 7HQ,United Kingdom;

    Kroto Research Institute,Department of Civil and Structural Engineering,The University of Sheffield,Sheffield,South Yorkshire S3 7HQ,United Kingdom;

    Immobilisation Science Laboratory,Department of Materials Science and Engineering,The University of Sheffield,Sheffield,South Yorkshire SI 3JD,United Kingdom;

  • 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);
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