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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Behaviour of magnesium phosphate cement-based materials under gamma and alpha irradiation
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Behaviour of magnesium phosphate cement-based materials under gamma and alpha irradiation

机译：磷酸盐水泥基材料在γ和α辐射下的行为

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摘要

Stabilization and solidification of low- and intermediate-level radioactive waste using Portland cement, possibly blended with fly ash or blastfurnace slag, is a well-established practice. However, when the waste contains high amounts of alpha emitters, this solution can be restricted by the strong release of radiolytic gases, wherein H-2 is the most abundant. This work investigates the interest of using magnesium potassium phosphate cement (MPC), a binder with a high chemical water demand, as a possible substitute to Portland cement (PC). The radiolytic gas production of PC and MPC pastes and mortars is determined under external gamma and internal alpha irradiation. The H-2 radiolytic yield of MPC materials is found to be 2 to 3 times smaller than that of PC references, provided that the main part of the mixing water is consumed by K-struvite formation. Moreover, gamma irradiation of a MPC mortar up to an integrated dose of 10 MGy has no significant influence on its mechanical strength (flexural, compressive) nor on its mineralogy. MPC materials are thus potential candidates for the conditioning of high amounts of radioactivity with limited H-2 release. The H-2 production of MPC materials can be reduced further by adding radical scavengers or H-2 getters within the matrix. However, other radiolytic gases such as O-2 are often produced, making these solutions potentially less attractive considering the concern of pressure build-up within the cemented waste package. (C) 2020 Elsevier B.V. All rights reserved.
机译：使用波特兰水泥的低级和中级放射性废物的稳定和凝固，可能与粉煤灰或底砂渣混合，是一种良好的实践。然而，当废物含有大量的α发射器时，该溶液可以通过辐射性气体的强释放来限制，其中H-2是最丰富的。这项工作调查了使用磷酸镁水泥（MPC），粘合剂具有高化学用水需求的兴趣，因为可能替代波特兰水泥（PC）。在外部γ和内部α辐射下测定PC和MPC糊剂和砂浆的辐射性气体生产。发现MPC材料的H-2辐射性产率比PC参考的比例小2至3倍，条件是通过K-斯特鲁维特地层消耗混合水的主要部分。此外，MPC砂浆的γ辐射到10 MGY的综合剂量对其机械强度（弯曲，压缩）或其矿物质没有显着影响。因此，MPC材料是具有限制H-2释放的大量放射性的潜在候选者。通过在基质内添加自由基清除剂或H-2吸管，可以进一步减少MPC材料的H-2生产。然而，通常生产其他辐射性气体如O-2，使得这些解决方案可能更少吸引，考虑到粘合废物包装内的压力堆积的关注。 （c）2020 Elsevier B.v.保留所有权利。

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