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Solubility of uranium and thorium from a healing earth in synthetic gut fluids: A case study for use in dose assessments

机译:愈合肠道中合成土壤中铀和th的溶解度:用于剂量评估的案例研究

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摘要

The aim of this case study was to estimate the bioaccessibility of uranium (~(238)U) and thorium (~(232)Th) from a healing earth by analysing the solubility of these radionuclides in synthetic gastric and intestinal fluids. An easy applicable in vitro test system was used to investigate the fractional mobilization of the soil contaminants being potentially available for absorption under human in vivo conditions. These findings provided the basis for a prospective dose assessment. The solubility experiments were performed using two different in vitro digestion methods. The concentrations of ~(238)U and ~(232)Th in the solutions extracted from the soil were measured by inductively coupled plasma mass spectrometry (ICP-MS). The dissolved fractions in the synthetic gastrointestinal fluid ranged in average from 20.3% to 13.8% for ~(238)U and from 0.3% to 1.6% for~(232)Th, respectively, depending on the digestion method. Subsequently, the committed effective doses from intake of ~(238)U and ~(232)Th after ingestion of the healing earth during 1 year were evaluated for adult persons. Thereby ingestion dose coefficients calculated as a function of bioaccessibility were used. The dose assessments ranged between 4.3 × 10~(-7) -1.9 × 10~(-6) Sv y~(-1) for ~(238)U and 5.6 × 10~(-7) -3.3 × 20~(-6) Sv y~(-1) for ~(232)Th, respectively. On the basis of the assumptions and estimations made, the present work indicates a relatively low radiation risk due to ~(238)U and ~(232)Th after internal exposure of the healing earth.
机译:本案例研究的目的是通过分析这些放射性核素在合成胃液和肠液中的溶解度,从愈合的土壤中评估铀(〜(238)U)和th(〜(232)Th)的生物可及性。使用一种易于应用的体外测试系统来研究土壤污染物的部分动员情况,这些污染物在人类体内条件下可能可用于吸收。这些发现为前瞻性剂量评估提供了基础。使用两种不同的体外消化方法进行了溶解度实验。通过电感耦合等离子体质谱法(ICP-MS)测量从土壤中提取的溶液中〜(238)U和〜(232)Th的浓度。取决于消化方法,〜(238)U在合成胃肠液中的溶解分数平均分别为20.3%至13.8%和〜(232)Th从0.3%至1.6%。随后,针对成年人,评估了在一年内摄入愈合土后约〜(238)U和〜(232)Th摄入的有效剂量。因此,使用根据生物可及性计算的摄入剂量系数。 〜(238)U的剂量评估范围为4.3×10〜(-7)-1.9×10〜(-6)Sv y〜(-1)和5.6×10〜(-7)-3.3×20〜( -6)分别为〜(232)Th的Sv y〜(-1)。根据所做的假设和估计,本工作表明,在治愈性土壤内部暴露后,由于〜(238)U和〜(232)Th而导致的辐射风险相对较低。

著录项

  • 来源
    《Science of the total environment》 |2010年第23期|p.5794-5800|共7页
  • 作者单位

    Department for Medical Radiation Physics and Diagnostics, Helmholtz Zentrum Muenchen-Cerman Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764 Neuherberg, Germany;

    Department for Medical Radiation Physics and Diagnostics, Helmholtz Zentrum Muenchen-Cerman Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764 Neuherberg, Germany;

    Institute of Radiation Protection, Ingolstadter Landstrasse 1, 85764 Neuherberg, Germany,FUCRO-HGN, Department of Environmental Radioactivity, Pillmannstr. 10,38112 Braunschweig, Germany;

    Institute of Radiation Protection, Ingolstadter Landstrasse 1, 85764 Neuherberg, Germany,Federal Office for Radiation Protection. Section SG 2.4 Incorporation Monitoring, Ingolstadter Landstr. 1,85764 Neuherberg, Germany;

    Department for Medical Radiation Physics and Diagnostics, Helmholtz Zentrum Muenchen-Cerman Research Center for Environmental Health, Ingolstaedter Landstrasse 1, 85764 Neuherberg, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    uranium; thorium; bioaccessibility; soil; ingestion; dose assessments;

    机译:铀;钍;生物可及性;泥;摄取剂量评估;
  • 入库时间 2022-08-17 13:56:25

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