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Intensive evaluation of radiation stability of phlogopite single crystals under high doses of gamma-ray irradiation

机译：高剂量γ射线照射下植物单晶辐射稳定性的密集评价

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The evaluation of radiation stability of clay is important for the disposal of high-level radioactive waste (HLRW). In this study, phlogopite single crystals were irradiated by Co-60 g-rays in air at a dose rate of 3.254 kGy h(-1) with doses up to 1000 kGy. Subsequently, the radiation stability and mechanism of radiation damage were explored by RS, FT-ATR, XRD, TGA, CA, and SEM techniques. In general, phlogopite single crystals show worthwhile radiation resistance toward their chemical structure but poor radiation stability toward their crystalline structure. Upon irradiation, their chemical structure changed slightly, while their crystalline structure varied obviously. For the 1000 kGy-irradiated sample, the interlayer space d of the (001) lattice plane increased by more than 1% with a value close to 0.13 degrees A, showing expansion. This could be mainly ascribed to H2O radiolysis and framework breakage: the former seems more important. These variations had a considerable impact on surface hydrophilicity, while they had marginal impacts on thermal stability and morphology: the effect on surface hydrophilicity is dosedependent. A lower dose of irradiation sufficiently reduced the hydrophilicity, while a higher dose recovered the hydrophilicity. For instance, the CA increased from 14 degrees to 28 degrees with dose increases from 0 kGy to 200 kGy and then decreased to approximately 20 degrees as the dose continued to increase to 1000 kGy. In general, the crystalline structure is more sensitive toward g-ray irradiation and phlogopites could be regarded as poorly radiation-resistant. In this procedure, H2O radiolysis occupies a crucial role and seems to be the dominant factor. This finding is meaningful to evaluate the radiation stability of clay matrixes and to understand the microscopic property variations in clays used in practice when they are under irradiation.
机译：粘土辐射稳定性的评价对于处理高级放射性废物（HLRW）是重要的。在该研究中，通过3.254 kgyh（-1）的剂量率，在空气中通过CO-60 G射线照射絮凝物单晶，剂量高达1000 kgy。随后，RS，FT-ATR，XRD，TGA，CA和SEM技术探索了辐射稳定性和辐射损伤机制。通常，植物单晶是对其化学结构的有价值的辐射抗性，但朝向其晶体结构的辐射稳定性差。在照射时，它们的化学结构略微发生变化，而其晶体结构明显变化。对于1000 kgy照射的样品，（001）晶格平面的层间空间D增加了超过1％，值接近0.13度，表示膨胀。这可能主要归因于H2O放射性和框架破损：前者似乎更重要。这些变化对表面亲水性具有相当大的影响，而它们对热稳定性和形态产生了边缘影响：对表面亲水性的影响已被依赖。较低剂量的照射充分降低了亲水性，而较高剂量回收亲水性。例如，Ca从14度增加到28度，剂量从0 kgy增加到200kgy，然后随着剂量继续增加到1000 kgy，随后减少到大约20度。通常，晶体结构对G射线照射更敏感，并且可以被视为抗辐射差的抗性。在此方法中，H 2 O辐射含量占据至关重要的作用，似乎是主要因素。该发现是有意思地评估粘土基质的辐射稳定性，并了解在辐照下实践中使用的粘土中的微观性能变化。

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  • 来源
    《RSC Advances》 |2019年第11期|共12页
  • 作者

    Wang Honglong; Sun Yaping; Chu Jian; Wang Xu; Zhang Ming;

  • 作者单位

    China Acad Engn Phys Inst Mat Jiangyou 621908 Peoples R China;

    China Acad Engn Phys Inst Mat Jiangyou 621908 Peoples R China;

    China Acad Engn Phys Inst Mat Jiangyou 621908 Peoples R China;

    China Acad Engn Phys Inst Mat Jiangyou 621908 Peoples R China;

    China Acad Engn Phys Inst Mat Jiangyou 621908 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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